# NEET and AIPMT NEET Physics Ray Optics and Optical Instruments MCQ Questions Solved

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Concept Videos :-

#10 | Image Formation in Refraction
#11 | Lens
#12 | Problems
#13 | Image Formed by Lens

Concept Questions :-

Lenses

(1)

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A converging beam of light is incident on a concave lens of focal length 30cm, in such a way that their point of intersection lies at a height 1cm above the principal axis at a distance 24cm from the lens. Find the nature of the image

1.  Real at a distance 60cm from lens

2.  Real at a distance 120cm from lens

3.  Virtual at a distance 60cm from lens

4.  Virtual at a distance 120 cm from lens

The rays would meet at O if there was no lens.
Now, they will meet at O' as lens will diverge them.
So, the object is virtual.
u=24 cm
f=-30
Using lens formula:-

$\frac{1}{\mathrm{f}}=\frac{1}{\mathrm{v}}-\frac{1}{\mathrm{u}}\phantom{\rule{0ex}{0ex}}-\frac{1}{30}=\frac{1}{\mathrm{v}}-\frac{1}{24}\phantom{\rule{0ex}{0ex}}\frac{1}{\mathrm{v}}=\frac{1}{24}-\frac{1}{30}\phantom{\rule{0ex}{0ex}}\mathrm{v}=120\mathrm{cm}$

Image is real as the rays will meet at 120 cm after diversion by lens.

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