NEET Physics Ray Optics and Optical Instruments Questions Solved


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(1) 

m=vu=110v=u10Using lens formula-1v-1u=1f10u-1u=1-25u=-225 cm

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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:-

1f=1v-1u-130=1v-1241v=124-130v=120cm

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

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