1. When light wave suffers reflection at the interface from air to glass, the change in phase of the reflected wave is equal to

2. An object of size 7.5 cm  is placed in front of a convex mirror of radius of curvature 25 cm at a distance of 40 cm. The size of the image should be

3. A vessel of depth 2d cm is half filled with a liquid of refractive index μ₁ and the upper half with a liquid of refractive index μ₂. The apparent depth of the vessel seen perpendicularly is

4. What is the time taken (in seconds) to cross a glass of thickness 4 mm and μ = 3 by light      

5. In the figure shown, for an angle of incidence 45° at the top surface, what is the minimum refractive index needed for total internal reflection at vertical face     

6. A fist looking from within water sees the outside world through a circular horizon. If the fish 2.64 cm below the surface of water, what will be the radius of the circular horizon                 

7.The radius of curvature for a convex lens is 40 cm, for each surface. Its refractive index is 1.5. The focal length will be

8. A lens which has focal length of 4 cm and refractive index of 1.4 is immersed in a liquid of refractive index 1.6, then the focal length will be

9. A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the object placed 60 cm away

10.The length of the compound microscope is 14 cm. The magnifying power for relaxed eye is 25. If the focal length of eye lens is 5 cm, then the object distance for objective lens will be