Optics Mock Tests

A concave mirror of focal length f produces a real image that is 3 times the size of the object. The object distance is:

Dispersion of white light through a prism occurs because:

Light travels from glass (refractive index 1.5) to air. The critical angle for total internal reflection is approximately:

A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 30 cm. The combination behaves like:

Light is incident on the surface of water (refractive index 4/3) from glass (refractive index 3/2). The critical angle for total internal reflection is:

A concave mirror of focal length f produces a real image that is n times the size of the object. The object distance is:

A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length −20 cm. The combination behaves like:

In Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3, the new fringe width will be: