Question

An object is 2 m from a lens which forms an erect image one-fourth (exactly) the size of the object. Determine the focal length of the lens. What type of lens is this?

Answer 1

Answer:

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Answer 2

The type of lens used here is Concave.

Explanation:

Given,

         $u=-2 m$

        $M=\frac{1}{4}=\frac{v}{u}$

         $\frac{1}{4}=\frac{V}{-2}$

         $V=0.5 \mathrm{m}$

         $\frac{1}{f}=\frac{-3}{2}$

        $F=\frac{-2}{3} m$

• Hence we can conclude that the lens used here is the concave lens.
• Basically Concave lens causes light to spread out, which results in a smaller image also makes bigger size.
• Concave lens are used for the several uses including eyeglasses and contacts, flash lights, peepholes, binoculars.