NEET

A person is six feet tall. How tall must a vertical mirror be if he is able to see his entire length?

Solution

To see his full image in a plane mirror a person requires a mirror of at least half of his height.

The refractive index of the material of the prismis √3; then the angle of minimum deviation of the prism is

A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together. What will be their resulting power?

A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together. What will be their resulting power?

The distance between an object and its real image formed by a convex lens cannot be

Solution

Least distance is 4f when object is at radius of curvature,and greatest is infinity.

An object is placed between two parallel mirrors. The number of images formed is

Solution

\(n=\frac{360 ^{\circ}}{0} \Rightarrow \frac{360 ^{\circ}}{0}=infinity\)

When red glass is heated in dark room, it will seem

Solution

When a red glass is heated to a high temperature it will glow with green light.

For normal vision, what is distance of object from eye?

In secondary rainbow what is the order of colours observed from earth?

In primary rainbow what is the order of colours observed from earth ?

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