DELHI PUBLIC SCHOOL JALANDHAR. (a) Assignment will be discussed and solved in the Class. ( In Physics Notebook)
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1 DELHI PUBLIC SCHOOL JALANDHAR DELHI REVISION ASSIGNMENT NO. 3 Instructions: SUBJECT: PHYSICS CLASS:10 Previous Year Questions (Miscellaneous ) (a) Assignment will be discussed and solved in the Class. ( In Physics Notebook) (b) For the revision class it s mandatory for every student to carry the Printout of the assignment. (1 st Feb 2017 onwards) Q1. AB and CD, two spherical mirrors, from parts of a hollow spherical ball with its centre at O as shown in the diagram. If arc AB = 1212 arc CD, what is the ratio of their focal lengths? State which of the two mirrors will always form virtual image of an object placed in front of it and why. Q2. At what distance from a concave lens of focal length 20 cm a 6 cm tall object is placed so as to obtain its image at 15 cm from the lens? Also calculate the size of the image formed. Draw a ray diagram to justify your Ans for the above situation and label it. Q3. (a) What is dispersion of white light? State its cause. (b) "Rainbow is an example of dispersion of sunlight." Justify this statement by explaining, with the help of a labelled diagram, the formation of a rainbow in the sky. List two essential conditions for observing arainbow.
2 Q4. To find the image distance for varying object distances in case of a convex lens of focal length 15 cm, a student obtains on a screen a sharp image of a bright object by placing it at 20 cm distance from the lens. After that he gradually moves the object away from the lens and each time focuses the image on the screen. (a) In which direction-towards or away from the lens does he move the screen to focus the object? (b) How does the size of image change? (c) Approximately at what distance does he obtain the image of magnification 1? (d) How does the intensity of image change as the object moves farther and farther away from the lens? Q5. A ray of light is incident on a convex mirror as shown. Redraw the diagram and complete the path of this ray after reflection from the mirror. Mark angle of incidence and angle of reflection on it. Q6. What is meant by scattering of light? The sky appears blue and the sun appears reddish at sunrise and sunset. Explain these phenomena with reason. Q7. (a) Draw a ray diagram to show the formation of image by a concave lens when an object is placed in front of it. (b) In the above diagram mark the object distance (u) and the image distance (v) with their proper signs (+ve or ve as per the new Cartesian sign convention) and state how these distances are related to the focal length (f) of the concave lens in the case. (c) Find the nature and power of a lens which forms a real and inverted image of magnification 1 at a distance of 40 cm from the optical centre. Q8 (a) Define the following terms in the context of spherical mirrors: (iii) (iv) (b) Pole Centre of curvature Principal axis Principal focus Draw ray diagrams to show the principal focus of a concave mirror convex mirror
3 (c) Consider the following diagram in which M is a mirror and P is an object and Q is its magnified image formed by the mirror. State the type of the mirror M and one characteristic property of the image Q9 (a) Write the function of each of the following parts of the human eye: Cornea; iris; crystalline lens; ciliary muscles (b) Millions of people in the developing countries of the world are suffering from corneal blindness. These persons can be cured by replacing the defective cornea with the cornea of a donated eye. A charitable society of your city has organised a campaign in your neighbourhood in order to create awareness about this fact. If you are asked to participate in this mission, how would you contribute in this noble cause? State the objective of organising such campaigns. List two arguments which you would give to motivate the people to donate their eyes after death. (iii) List two values which are developed in the persons who actively participate and contribute in such programmes. Q10 A student focuses the image of a well-illuminated distant object on a screen using a convex lens. After that, he gradually moves the object towards the lens and each time focuses its image on the screen by adjusting the lens. lens? In which direction, towards the screen or away from the screen, does he move the What happens to the size of the image? Does it decrease or increase? (iii) What happens to the image on the screen when he moves the object very close to the lens?
4 Q11. The refractive indices of glass and water with respect to air are 3/2 and 4/3, respectively. If speed of light in glass is 2 x 10 8 m / s, find the speed of light in water. Q12 The image formed by a spherical mirror is real, inverted and is of magnification 2. If the image is at a distance of 30 cm from the mirror, where is the object placed? Find the focal length of the mirror. List two characteristics of the image formed if the object is moved 10 cm towards the mirror. Q13 Describe an activity to show that the colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also, draw a ray diagram to show the recombination of the spectrum of white light. Q14 It is desired to obtain an erect image of an object using concave mirror of focal length 12 cm. What should be the range of distance of an object placed in front of the mirror? Will the image be smaller or larger than the object? Draw a ray diagram to show the formation of image in this case. (iii) Where will the image of this object be if it is placed 24 cm in front of the mirror? Draw a ray diagram for this situation to justify your answer. Show the positions of the pole, the principal focus and the centre of curvature in the above ray diagrams. Q.15 What is atmospheric refraction? Use this phenomenon to explain the following natural events: (a) (b) Twinkling of stars Advanced sunrise and delayed sunset Draw diagrams to illustrate your answer. Q16 (a) Define focal length of a divergent lens. (b) A divergent lens of focal length 30 cm forms the image of an object of size 6 cm on the same side as the object at a distance of 15 cm from its optical centre. Use lens formula to determine the distance of the object from the lens and the size of the image formed.
5 (c) Draw a ray diagram to show the formation of image in the above situation. Q17. An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre 'O' of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark the optical centre 'O', principal focus F and height of the image on the diagram. Q18 What is meant by power of a lens? What does its sign (+ve or ve) indicate? State its S.I. unit. How is this unit related to focal length of a lens? Q19 (a) Draw a ray diagram to show the refraction of light through a glass slab and mark angle of refraction and the lateral shift suffered by the ray of light while passing through the slab. (b) If the refractive index of glass for light going from air to glass is 3/2, find the refractive index of air for light going from glass to air. Q20. State the cause of dispersion of white light passing through a glass prism. How did Newton show that white light of sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.
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