CBSE Class 10 Science 2017 · Paper 31/3 · Question 16

Light - Reflection and Refraction 3 marks Medium

“A lens can form a magnified erect image as well as magnified inverted image of an object placed in front of it.” State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of

O

F

and

2 F

in the diagram.

Answer

A convex lens: magnified erect image for an object between F and O, magnified inverted image for an object between F and 2F.

The lens is a convex (converging) lens. A concave lens always forms a virtual, erect and diminished image of a real object, so only a convex lens can form magnified images. (i) Magnified erect image: the object is placed between

F_{1}

and

O

. The ray parallel to the axis is refracted through

F_{2}

and the ray through

O

goes straight on; the refracted rays diverge, and their backward extensions meet on the object's side, giving a virtual, erect, magnified image (first ray diagram). (ii) Magnified inverted image: the object is placed between

F_{1}

and

2 F_{1}

. The same two rays meet beyond

2 F_{2}

on the other side of the lens, giving a real, inverted, magnified image (second ray diagram).

O

F_{1}

F_{2}

2 F_{1}

and

2 F_{2}

are marked on the principal axis in both diagrams.

🔒 Step-by-step solution

From the board paper

CBSE Class 10 Science 2017 · Paper 31/3, Question 16 — all 36 questions with answers →

CBSE Class 10 Science 2017 · Paper 31/3 · Question 16

Answer

From the board paper

More questions from Light - Reflection and Refraction