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Class 12 Physics Practice Test: Reflection of Light by Spherical Mirrors
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Class 12 Physics Practice Test: Reflection of Light by Spherical Mirrors
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10 Questions

1. A concave mirror is held in water. What should be the change in the focal length of the mirror?
2. The magnification of ‘X’ is more than unity. Identify X.
3. What happens to the shining of diamond if it is dipped in a transparent oil?
4. Two concave mirrors have the same focal length but the aperture of one is larger than that of the other. Which mirror forms the sharper image and why?
5. Which of the following causes refraction of light?
6. Frequency and wavelength change when light passes from a rarer to a denser medium.
7. A man stands in front of a mirror of special shape. He finds that his image has a very small head, a fat body, and legs of normal size. What can we say about the shapes of the three parts of the mirror?
8. If the radius of curvature of each face of the biconcave lens, made of glass of refractive index 1.25 is 50 cm, then what is the focal length of the lens in air?
9. Can the relative refractive index of a medium w.r.t. another medium be less than unity?
10. Calculate its focal length if the radii of curvature of a double convex lens are 10 cm, and 20 cm and its refractive index is 1.75.

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