An object is placed at a certain distance from a convex lens of focal length 20 cm. Find the distance of the object if the image obtained is magnified 4 times.

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An object is placed 40 cm from a convex lens of focal length 20 cm. Calculate image distance.

Complete the following sentences :

(a) An object is placed at a distance of more than 40 cm from a convex lens of focal length 20 cm. The image formed is real, inverted and ..........

(b) An object is placed at a distance 2f from a convex of lens of focal length f. The size of image formed is ............ that of the object.

(c) An object is placed at a distance 5 cm from a convex of focal length 10 cm. The image formed is virtual, upright and ............

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