Q.1. Find the focal length of a convex mirror of radius of curvature 1 m.
Q.2. Focal length of a convex mirror is 50 cm. What is its radius of curvature?
Q.3. Radius of curvature of a concave mirror is 25 cm. What is its focal length?
Q.4. A concave mirror produces 10 cm long image of an object of height of 2 cm. What is the
magnification produced?
Q.5. An object 1 cm high is held near a concave mirror of magnification 10. How tall will be the
image?
Q.6. An object 4 cm in size is placed at a distance of 25 cm from a concave mirror of focal
length 15 cm. Find the position, nature and height of the image.
Q.7. A converging mirror forms a real image of height 4 cm, of an object of height 1 cm placed
20 cm away from the mirror. Calculate the image distance. What is the focal length of the
mirror?
Q.8. A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the
location of the image and the magnification. Describe what happens as the needle is moved
farther from the mirror.
Q.9. An arrow 2.5 cm high is placed at a distance of 25 cm from a diverging mirror of focal
length 20 cm., Find the nature, position and size of the image formed.
Q.10. The image formed by a convex mirror of focal length 20cm is a quarter of the object. What
is the distance of the object from the mirror?
Q.11. Find the size, nature and position of image formed by a concave mirror, when an object of
size 1cm is placed at a distance of 15cm. Given focal length of mirror is 10cm.
Q.12. An object 2cm high is placed at a distance of 16cm from a concave mirror, which
produces 3cm high inverted image. What is the focal length of the mirror? Also, find the position
of the image.
Q.13. An erect image 3 times the size of the object is obtained with a concave mirror of radius of
curvature 36cm. What is the position of the object?
Q.14. A 2.5cm candle is placed 12 cm away from a convex mirror of focal length 30cm. Give the
location of the image and the magnification.
Q.15. An object is placed in front of a concave mirror of focal length 20cm. The image formed is
3 times the size of the object. Calculate two possible distances of the object from the mirror.
Q.16. The image formed by a convex mirror is virtual, erect and smaller in size. Illustrate with
figure.
Q.17. A concave mirror produces a real image 10mm tall, of an object 2.5mm tall placed at 5cm
from the mirror. Calculate focal length of the mirror and the position of the image.
Q.18. An object is placed at a large distance in front of a convex mirror of radius of curvature
40cm. How far is the image behind the mirror?
Q.19. An object is placed 15cm from a convex mirror of radius of curvature 90cm. Calculate
position of the image and its magnification.
Q.20. The image formed by a convex mirror of focal length 30cm is a quarter of the object. What
is the distance of the object from the mirror?
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Answer:
The answer is 0.5 m. Explanation: Focal length is the distance between the center of a lens and a convex or concave mirror.
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