If a piece of paper is placed at the position of a virtual image of a strong light source, will the paper burn after sufficient time ? What happens if the image is real? What happens if the image is real but the source is virtual ?

What happens to the image distance in the eye when we increase the distance of an object from the eye?

What happens to the image-distance in the normal eye, when we increase the distance of an object from the eye?

An object of size 3.0cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens?

An object is kept at a distance of 16 cm from a thin lens and the image formed is real. If the object is kept at a distance of 6 cm from the same lens, the image formed is virtual. If the size of the image formed are equal, the focal length of the lens will be

A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror.

in figure shown AB is a plane mirror of length 40cm placed at a height 40cm from ground . There is a light source S at a point on the ground ,Find the maximum and minimum height of a man(eye height)required to see the image of the source If he is standing at a point A on ground shown in figure.

A point source of light S is placed in front of two large mirros as shown .Which of the following observes will see only one image of S?

A concave mirror has the form of a hemisphere with a radius of R=60cm A thin layer of an unknown transparent liquid is poured into the mirror ,The mirror-liquids system forms one real Image and another real image is formed by mirror alone ,with the sources in a certain position .One of them coincides with the source and the other is at distance of l=30 cm from source.find the possible value(s) refractive index mu of the liquid.

A diverging lens of focal length 10cm is placed 10cm in front of a plane mirror as shown in Fig. Light from a very far away source falls on the lens. What is the distance of final image?