1. To an astronaut in space, the sky will appear to be
2. What is the absolute refractive index of air?
3. Light is a transverse wave, which of the only event proving this?
4. Near-sightedness in humans is called:
5. Which one of the following is not a luminous object?
6. In a concave mirror when the object is placed at infinity which of the following applies to the image?
7. What is the distance between the focal point or focus point in the lens and the vision center or optical center?
8. Rainbow is seen after rain because of hanging molecules of water which act as
9. Match List-I with List-II and select the correct answer:
List-I (Disease)
List-II (Remedy)
a. Hypermetropia
1. Concave lens
b. Presbyopia
2. Bifocal lens
c. Myopia
3. Surgery
d. Cataract
4. Convex lens
| List-I (Disease) | List-II (Remedy) |
| a. Hypermetropia | 1. Concave lens |
| b. Presbyopia | 2. Bifocal lens |
| c. Myopia | 3. Surgery |
| d. Cataract | 4. Convex lens |
10. The correct relation between the radius of curvature R and focal length f of a spherical mirror is
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