Physics Test 78

When a ray of light enters a glass slab from air :-

In a compound microscope, the intermediate image is :-

A plano-convex lens has focal length ƒ = 20 cm. If its plane surface is silvered, then the new focal length will be :-

The angle of prism is 30°. The rays incident at an angle of 60° at one refracting face suffer a deviation of 30°. Then the angle of emergence is :-

To get three images of a single object, one should have two plane mirrors at an angle of :-

An object of length 6 cm is placed on the principal axis of a concave mirror of focal length ƒ at a distance 4ƒ. The length of the image will be :-

The angular dispersion for a lens is 0.0178 and deviation for yellow light is 0.5170, then dispersive power is :-

A man suffering from short sight is unable to see objects distinctly at a distance greater than 2 m. The power of lens required to correct this defect should be :-

Two lenses of power –15 D and + 5 D are in contact with each other. The focal length of the combination is :-