1.

A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in fron of the convex lens if theimage is equal to the size of the object? Also, find the power of the lens.

Answer»

SOLUTION :v=+50 CM (image is REAL)
m=-1 (SIZE of image =size of object and image is inverted)
U=?
`m=v/u` or ` u=v/m=50/(-1)` or u=-50cm `1/f=1/v-1/u`
`=1/50-1/(-50)=1/50+1/50=2/50`
`f=50/2=2.5cm`


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