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Combinations of Lenses & Mirrors

Where should ...

Question

Where should an object be placed so that a real and inverted image of same size is obtained using a convex lens?

A

Between the lens and its focus

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B

At the focus

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C

At twice the focal length

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D

At infinity

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Solution

The correct option is B At twice the focal length
In case of convex lens when an object is placed at centre of curvature, a real, inverted and equal size image is obtained on the other centre of curvature.

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Q. An image of the same size is obtained if the object is placed in front of a convex lens

(a) at infinity
(b) at the focus
(c) at twice the focal length
(d) between focus and the lens

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

(a) At the principal focus of the lens

(b) At twice the focal length

(c) At infinity

(d) Between the optical centre of the lens and its principal focus.

Q. Question 3
Where should an object be placed in front of a convex lens to get a real image of the size of the object?

(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus

Q. A convex lens has a focal length of 20 cm. Where should an object be placed in front of this convex lens so as to obtained an image which is real, inverted and same size as the object? Draw the ray diagram to show the formation of image in this case.

(i)

Where should an object be placed so that a real and inverted image of the same size as the object is obtained using a convex lens?

(i i)

Draw a ray diagram to show the formation of the image specified in the part

(i)

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