Question

(a) write any two difference between real and vitual image. (b) where should an object be placed in front of a convex lens to get a virtual images ? is the image magnifet or diminished with respect to the objects? draw a ray diagram to justify your answer,​

Answer 1

Explanation:

Concave lens produces a virtual image between the object and lens. The concave lens always forms images either at the focus or between the focus and the optical centre (in the same side of the object). Such images are always virtual, erect and diminished.

(ii) The ray diagram is shown for the image formation when the object is placed beyond 2F

2

. Here the image is formed between F

2

and the optical centre.

Answer 2

Answer:

(a) Real Image :- (i) Real images are formed due to the actual intersection of light rays .

(ii) Real images are formed on the screen

virtual image :- (i) Virtual images are formed due to the imaginary intersection of light rays

(ii) Virtual images appear to be on the lens or the mirror itself

(b) At twice the focal length, the image formed by the convex lens is real and of the same size as the object.