Chapter 1: Light - Reflection and Refraction

Q&A -Ask Doubts and Get Answers

Q
Light - Reflection and Reflection

Question:

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens of focal length 50 cm.

(b) A concave lens of focal length 50 cm.

(c) A convex lens of focal length 5 cm.

(d) A concave lens of focal length 5 cm.

Answer:

The correct option is (c).

(c) A convex lens of focal length 5 cm can be used while reading small letters found in a dictionary.

Because convex lens can form magnified image of the object when it is placed between the centre of curvature and focal point. The magnification is more for the lens having shorter focal length that why we should prefer convex lens of focal length 5 cm from the given options.

Convex lens is also used as a magnifying glass.


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