In an experiment to determine the focal length (f) of a concave...

In an experiment to determine the focal length

(f)

of a concave mirror by the

u-v

method, a student places the object pin

A

on the principal axis at a distance

x

from the pole

P

. The student looks at the pin and its inverted image from a distance keeping his/her eye in line with PA. When the student shifts his/her eye towards left, the image appears to the right of the object pin. Then In an experiment to determine the focal length (f) of a concave mirror by the u-v method, a student places the object

In an experiment to determine the focal length (f) of a concave mirror by the u-v method, a student places the object

Options

A $x < f$
B $f < x < 2 f$
C $x=2 f$
D $x>2 f$

Correct answer

B. $f < x < 2 f$

Step-by-step solution

Since object and image move in opposite directions, the positioning should be as shown in the figure. Object lies between focus and centre of curvature $

f < x < 2 f

\text{. } \therefore$ Correct option is (b). In an experiment to determine the focal length (f) of a concave mirror by the u-v method, a student places the object

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