A lens of focal length f =10.0cm is placed 8cm from an object. Which of the foll

Question

A lens of focal length f =10.0cm is placed 8cm from an object. Which of the following descriptions of the image is true?
A. A real image is formed.
B. The image is smaller than the object.
C. The orientation of the image is opposite to that of the object.
D. The image is on the same side as the object.
E. no image will be formed. A lens of focal length f =10.0cm is placed 8cm from an object. Which of the following descriptions of the image is true?
A lens of focal length f =10.0cm is placed 8cm from an object. Which of the following descriptions of the image is true?
A real image is formed.
A real image is formed.
A real image is formed.
A real image is formed.
The image is smaller than the object.
The image is smaller than the object.
The image is smaller than the object.
The image is smaller than the object.
The orientation of the image is opposite to that of the object.
The orientation of the image is opposite to that of the object.
The orientation of the image is opposite to that of the object.
The orientation of the image is opposite to that of the object.
The image is on the same side as the object.
The image is on the same side as the object.
The image is on the same side as the object.
The image is on the same side as the object.
no image will be formed. no image will be formed. no image will be formed. A. A real image is formed.
B. The image is smaller than the object.
C. The orientation of the image is opposite to that of the object.
D. The image is on the same side as the object.
E. no image will be formed.

Explanation / Answer

1/f = 1/ u + 1/v

so 1/v = 1/f -1 /u

v = uf/(u-f)

v = 8 * 10/( 8-10 ) = -40 cm

so image is formed at - 40cm

as this is opposite to the object point

magnification m = -V/u = 40/8 = 5

image is larger

so options A is correct

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