In the human eye, pictures are recorded by

An object 4 cm high is placed at a distance of 12 cm from a concave lens, If the focal length is 8 cm then the position of the object is

The center of a sphere of the spherical mirror is called

The lens which is thick at the center but thin at the edges is called

If an object is 14 cm in front of the convex mirror and image distance is 5.8 cm then it's focal length is

Rough surfaces reflect rays of light in

Speed of light in air/speed of light in a medium is equal to the index of

A telescope that uses two converging lenses is called

A convex lens of focal length 8 cm is to be used to form a virtual image 2 times the size of the object. Where must the lens be placed?

The core is made of glass or plastic of relatively

The minimum distance of an object from the eye at which it produces a sharp image on the retina is known as

The size of the image depends on the position of the object in

The distance between the optical center and principal focus is

If f_o is the focal length of the objective and f_e is the focal length of the eyepiece, then magnification of a refracting (M) telescope can be determined as

The mirror formula is

If a concave lens has a focal length of 15 cm and image distance is 10 cm then object distance is

One side of the spherical mirror is opaque and the other side is

A girl 1.8 m tall is standing 2.8 m in front of a camera which is using a convex lens having a focal length of 0.04 m. The image is

If the object is towards the left side of the lens, the object distance will be

The relation between the object and image distance from the lens in terms of the focal length of the lens is called

The entire light is reflected into the denser medium, which is called total

The relationship between object distance (p), image distance (q) from the mirror and focal length (f) of the mirror is known as

The speed of light in glass is approximately

The angle of reflection and the angle of reflection are

The speed of light in water is approximately

The inner part of the fiber optics which carries light is called

An object 12 cm in front of a convex mirror forms an image 6 cm behind the mirror. The focal length of the mirror is

The lens which causes incident parallel rays of light to diverge at a point is called

A magnifying glass forms

The endoscope used to examine the throat is called