CBSE - Light Refraction

A student was asked to draw a ray diagram for formation of image by convex lens for the following positions the object : (A) between F and 2F (B) at F (C) at 2F (D) between F and optical centre The position for which virtual image can be formed among these is - (1) B (2) A (3) C (4) D

You are provided with a concave lens having focal length 15 cm. If it diminishes the image by one-third, calculate the distance of image from lens? (1) 5 cm (2) 10 cm (3) 5 m (4) 10 m

The absolute refractive index of any medium is (1) 1 (2) &gt; 1 (3) &lt; 1 (4) 0

A convex lens of suitable focal length can correct man&#39; s eye problem of (1) Short sightedness (2) Long sightedness (3) Presbyopia (4) Astigmatism

The image produced by a concave lens is always (1) real (2) virtual (3) inverted (4) enlarged