Light

Calculate the focal length of a lens with power +2.0 D.

An object is placed at the center of curvature (C) of a concave mirror. The magnification produced is:

A ray of light enters a glass slab perpendicularly (at 90 degrees to the surface). The angle of refraction is:

The critical angle for a medium is 45 degrees. What is its refractive index?

For a convex lens, where should an object be placed to get a virtual and magnified image?

Total Internal Reflection occurs when light travels from:

What is the relation between the radius of curvature (R) and focal length (f) of a spherical mirror?

A convex mirror always produces an image which is:

If an object is placed 20 cm from a concave mirror of focal length 10 cm, the image is formed:

Which of the following is the correct lens formula?

A diver inside water sees the outside world through a circular area. This is due to:

In which medium is the speed of light minimum?

The refractive index of glass with respect to air is 3/2. What is the refractive index of air with respect to glass?

The focal length of a plane mirror is:

What is the magnification of a plane mirror?

An object is placed at infinity from a convex lens. The image is formed at:

The power of a concave lens of focal length 25 cm is:

Which of the following is NOT a primary color of light?

The phenomenon of mirage is primarily due to:

What is the nature of the image formed by a human eye?