Question

* di, creet, aiminshed (b) 20 cm (negative
3. The focal length of a convex lens is 25 cm. At what
distance from the optical centre of the lens an object
be placed to obtain a virtual image of twice the
size ?
Ans. 12.5 cm in front of the lens
Hy Where should an object be placed in front of a
convex lens of focal length 0.12 m to obtain a real
image of size three times the size of the object, on
the screen ?
Ans. 0.16 m in front of lens
5. An illuminated object lies at a distance 1.0 m from
a screen. A convex lens is used to form the image
of object on a screen placed at distance 75 cm
from the lens. Find : (i) the focal length of lens,
and (ii) the magnfication. Ans.(i) 18.75 cm (ii) - 3
A lens forms the image of an object placed at
a distance 15 cm from it, at a distance 60 cm in
front of it. Find : (i) the focal length, (ii) the
magnification, and (iii) the nature of image.
Ans. (i) 20 cm (ii) + 4
al and magnified​

Answer 1

Answer:

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