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Class 12 Physics Practice Test: Ray Optics - Refraction at Spherical Surfaces and by Lenses
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Class 12 Physics Practice Test: Ray Optics - Refraction at Spherical Surfaces and by Lenses
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12 Questions

1. The power of a convex lens is negative.
2. Sign conventions for spherical refracting surface are the same as those for spherical mirrors.
3. What is the SI unit of power of a lens?
4. X is thicker in the middle than at the edges, whereas, Y is thicker at the edges than in the middle. Identify ‘X’ and ‘Y’.
5. Find the magnification of the lens if the focal length of the lens is 10 cm and the size of the image is -30 cm.
6. A lens has a power of +3 diopters in air. What will be the power of the lens if it is completely immersed in water? Given, μg = \(\frac {3}{2}\) and μw = \(\frac {4}{3}\).
7. Which among the following is a portion of a transparent refracting medium bound by one spherical surface and the other plane surface?
8. A lens has a focal length of 10 cm. Where the object should be placed if the image is to be 40 cm in the positive direction from the lens?
9. According to the thin lens formula, which one of the following is true regarding the focal length of the lens?
10. Calculate the focal length of a biconvex lens if the radii of its surfaces are 50 cm and 20 cm, and index of refraction of the lens glass = 1.2.
11. How many types of spherical refracting surfaces are there?
12. Identify the Lens Maker’s Formula.

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