A convex lens has a focal length of 10 cm. At which of the following positions should an object be placed so that this convex lens may act as a magnifying glass?

15 cm

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7 cm

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20 cm

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25 cm

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Solution

The correct option is B
7 cm

A convex lens casts a magnified image in the direction of object, when the object is placed at a distance less than the focal length

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Similar questions

Q. A convex lens has a focal length of 10 cm. At which of the following position should an object be placed so that this convex lens may act as a magnifying glass?

(a) 15 cm
(b) 7 cm
(c) 20 cm
(d) 25 cm

A convex lens has a focal length of 10 cm. At which of the following position should an object be placed so that this convex lens may act as a magnifying glass ? (a) 15 cm (b) 7 cm (c) 20 cm (d) 25 cm

Q. (a) What type of lens is used as a magnifying glass?
(b) What type of lens is used to correct the defect of vision called myopia?
(c) A convex lens has a focal length of 10.5 cm. Where should an object be placed in front of this convex lens so as to obtain an image which is real, inverted and same size as the object?

Q. A point object

O

is placed at a distance of

20 c m

from a convex lens of focal length

10 c m

as shown in fig. At what distance

x

from the lens should a concave mirror of focal length

60 c m

, be placed so that the final image coincides with the object?

Q. A plano convex lens

(μ = \frac{3}{2})

has radius of curvature R = 10 cm, and is placed at a distance of ‘b’ from a concave lens of focal length 20 cm as shown in the figure.
At what distance ‘a’ should a point object be placed from plano
convex lens, so that position of the final image is independent of ‘b’?

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A convex lens has a focal length of 10 cm. At which of the following positions should an object be placed so that this convex lens may act as a magnifying glass?

The correct option is B 7 cm A convex lens casts a magnified image in the direction of object, when the object is placed at a distance less than the focal length

The correct option is B
7 cm

A convex lens casts a magnified image in the direction of object, when the object is placed at a distance less than the focal length