The ray passing through the optical center passes straight through the lens and

To illuminate the inaccessible places, doctors and engineers use

The lens which causes incident parallel rays to converge at a point is called

A spherical mirror whose outer curved surface is reflecting is called

If I is the angle of incidence, r is the angle of refraction and n is the constant then sin I/sin r = n is known as

An object 20 cm tall is located 14 cm from a concave mirror having focal length 20 cm. The height of the object is

The angle of incidence 45° is greater than the critical angle of the glass which is

Lenses form images through

A smooth surface of silver reflects rays of light in

If the power of a convex lens is 5D then at what distance the object should be placed from the lens so that its real and 2 times larger image is formed?

The light is reflected by the prism through an angle of

An object is placed 5 cm in front of a concave mirror having a focal length 15 cm. The location of the image should be

An eye is a refracting system containing a

The branch of optics that focuses on the creation of images is called

For the particular value of the angle of incidence, the angle of refraction becomes

The line joining the center of curvature and pole of the spherical mirror is known as

Some people can not see distant objects clearly without spectacles. This defect is called

The focal length is positive for

The refractive index of a medium is

Only virtual and erect images can be formed by a

The short-sightedness can be corrected if

The endoscope used to examine the stomach is called

An object 20 cm tall is located 14 cm from a concave mirror having focal length 20 cm. The image is located at

The distance from the pole to the principal focus measured along the

In the fiber-optic thread, the refractive index of the inner core is

The radius of the sphere of which spherical mirror is a part is known as

The incident ray, the normal and the refracted ray at the point of incidence all lie in the same plane. This is the law of

As the focal length of a convex lens is positive, therefore its power should be

A lens which converges the incident rays on a single point is

The condition in which the image is formed behind the retina is called