Light Test - 2...

We always get real image in a convex lens if the object is situated beyond

A ray of light strikes a thick parallel sided glass slab with an angle of incidence of 40⁰. The angle of the beam emerging from the other side of the slab with the normal is

If f₀ and f_e are the focal lengths of the objective and eye – piece, respectively for a telescope, the magnifying power of the telescope will be

Dispersion produced by a prism depends upon

Coloured band of light obtained by dispersion of white light is called

The sky appears blue because the earth's atmosphere

In a room, artificial rain is produced at one end and a strong source of white light is switched on at the other end. To observe the rainbow, an observer must

An eye specialist prescribes spectacles having a combination of convex lens of focal length 50 cm in contact with a concave lens of focal length 25 cm. The power of this combination of lenses (in dioptre) is