Physics Worksheet Topic -Light Q1 If the radius of curvature of spherical mirror is 20 cm, what is its focal length. (Ans: 10 cm) Q2 Calculate the radius of curvature of spherical mirror whose focal length is 15 cm. (Ans: 30 cm) Q3 A concave mirror has a focal length of 10 cm. Where an object should be placed in front of the concave mirror so as to obtain an image which is real, inverted and same size as the object. (Ans: 20 cm) Q4 Calculate the size, nature and position of an image formed when an object size 1 cm is place at a distance of 15cm from a concave mirror of focal length10 cm. (Ans: Image distance = -30cm, real and inverted, image size = -2 cm) Q5 An object is 2 cm high is placed is placed at a distance of 16 cm from a concave mirror who produces real image of 3 cm high. Calculate focal length of the mirror and the position of the image. (Ans: focal length = -9.6 cm, -24 cm) Q6 A concave mirror produces three times magnified real image of an object placed at 10 cm in front of it. Calculate the position of image. (Ans: -30 cm) Q 7 when a object placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. Calculate the focal length of the mirror. (Ans: 6 cm)
Q 8 An object 3 cm high is placed at a distance of 8 cm from a concave mirror which produces a virtual image 4.5 cm. Calculate its focal length and position of image. (Ans: 24 cm, 12 cm) Q9 The size of an object is 7 cm and is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharp focused image can be formed and also find the size and nature of the object. (Ans: -54 cm, the screen should be placed at a distance of 54 cm in front of concave mirror; 14cm) Q10 An object 50mm high place on the axis of a concave mirror of focal length 100mm and at a distance of 30mm from the concave mirror. Calculate the size of an image. (And: 25 cm) Q11 when an object is placed at a distance of 50cm from a concave spherical mirror, the magnification produces is -1/2. Where should the object placed to get a magnification is -1/5. (Ans:100 cm) Q12 How far should an object is placed from the pole of converging mirror of focal length 20 cm to form a real image of the size exactly 1/4 of the size of object. (Ans : 100 cm ) Q13 An object is 24 cm away from a concave mirror and its image is 16 cm from the mirror. Find the focal length and the radius of curvature of the mirror and the magnification of the image. (Ans:9.6 cm, 19.2 cm, 0.66cm) Q14 A mirror form an image which is 30 cm from an object and twice its height. Calculate radius of curvature, identifying the type of mirror and also calculate the position of mirror. (Ans:40 cm, concave mirror, 10 cm from the object)
Q15 If a concave mirror has a focal length of 10 cm, find the two positions where an object can be placed to give in each case an image twice the height of the object. (And: 15 cm, 5 cm ) Q16 An object is 5 cm high is placed at a distance 10cm from a convex mirror whose radius of curvature 30cm. Find the nature, position and size of an image. ( Ans: virtual and erect, 6cm, 3cm) Q17 An object is placed at a distance of 6 cm from a convex mirror of 12 cm. Calculate the position and nature of the image. (Ans: 4 cm behind the mirror) Q18 An object is placed 20 cm in front of mirror is found to have an image I) In front of mirror ii) behind the mirror Calculate focal length and type of mirror. (And: concave mirror, focal length 60/7 cm) Q19 An object 20 cm from a spherical mirror gives rise to a virtual image of 15 cm behind the mirror. Calculate the magnification and type of image. ( Ans: + 0.75cm,convex mirror) Q20 An object is 1 cm tall is placed 30 cm in front of the convex mirror whose focal length 20 cm. Find the size and position of the image. ( Ans:12 cm, behind the mirror)
Q21 A diverging mirror of radius of curvature 40cm from an image which is half the height of the object. Calculate the object and image position. ( Ans:20cm, 10 cm behind the mirror) Q22 A shop security mirror 5 m from certain items display on the shop produces one- tenth of the magnification. Calculate the radius of curvature and type of mirror. ( Ans: 10/9 cm, convex mirror) Q23 A object 5 cm in the length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image in nature and size. ( Ans:+8.57 cm,2.1 cm, virtual and erect) Q24 An object of size 7 cm is placed at 27 cm in front of a concave mirror of focal length is 18 cm. At what distance from the mirror should a screen be placed so that a sharp focused image can be obtained. Find the size and nature of an image. ( Ans: -54 cm, real and inverted, -14 cm) Q 25 we wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object form the mirror? What's is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case. [CBSE 2013,14] Q26 Name the type of mirror used in the following conditions a) Headlights of car b) side/ rear - view mirror of a vehicle. Solar furnace. Support your answer with reason.[cbse 2012, 14]
Q 27 A object is placed at a distance of 10!cm from a convex mirror of focal length 15 cm. find the position and nature of the image.[cbse 2008] ( Ans: 6cm, virtual and erect image] Q 28 The magnification produced by a plane mirror is +'1. What does this means.[cbse2011, 2014] ( Ans: height of image = height of object] Q 29 An object is 5 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.[cbse2011] ( Ans: 8.6 cm, 2.2 cm, virtual and erect] Q30 An object of size 7 cm is placed at 27 cm in front of a concave mirror of local length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained? Find the size and the nature of the image. ( Ans: -54 cm, -14!cm, image below the principle axis)