11) A convex lens has focal length f. If an object is located at infinity (very

Question

11) A convex lens has focal length f. If an object is located at infinity (very far away), formed is located at a distance from the lens A) of f. B) of infinity. C) between f and 2f. D) between the lens and E) of 2f. 12) Which statement about a single thin lens is correct? 12) A) A diverging lens always produces a virtual inverted image. B) A converging lens always produces a real inverted image. C) A diverging lens produces a virtual upright image only if the object is located between the lens and its focal point. D) A diverging lens always produces a virtual upright image. 13) Monochromatic coherent light shines through a pair of slits. If the distance between these slits is 13 decreased, which of the following statements are true of the resulting interference pattern? A) The distance between the maxima stays the same. B) The distance between the minima stays the same. C) The distance between the maxima decreases. D) The distance between the maxima increases.

Explanation / Answer

11)

For a convex lens . when the object is placed at infinity , the image is formed at the focus of the lens , now ,

Here , the image is located at distance A)of f

12)

Here , for a diverging lens , the image is always virtual ,

and it is upright.

Hence , the correct choice is D)

13)

Here , for a pair of slits ,

the distance between the maxima is given as y = wavelength*D/d

D is the screen disatnce , d is slit width

when d is decreased ,

y increases ,

hence , D) the distance between the maxima increases

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