The Focal Length of; (i) Convex Mirror (ii) Concave Mirror, and (ii) Convex Lens, Using the Parallax Method NEET Questions

Physics - Experimental Skills

The Focal Length of; (i) Convex Mirror (ii) Concave Mirror, and (ii) Convex Lens, Using the Parallax Method MCQ Questions


1.
Which principle is used in the parallax method for determining focal length?
A.
Optical path length
B.
Relative motion
C.
Ray tracing
D.
Geometrical optics
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ANSWER :
B. Relative motion
2.
In the parallax method, how is the focal length of a convex lens determined?
A.
By measuring the radius of curvature
B.
By eliminating parallax
C.
By measuring the focal point shift
D.
By measuring focal shift using a mirror
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ANSWER :
B. By eliminating parallax
3.
What happens when there is no relative motion between the image and the object in the parallax method?
A.
The image is at the focal point
B.
The object is at twice the focal length
C.
The object and image coincide
D.
The object is beyond twice the focal length
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ANSWER :
B. The object is at twice the focal length
4.
Which of the following is the correct formula for focal length (f) using the u-v method for a convex lens?
A.
1/f = 1/u + 1/v
B.
1/f = u × v
C.
1/f = 1/u - 1/v
D.
1/f = v/u
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ANSWER :
A. 1/f = 1/u + 1/v
5.
Why is a distant object preferred when finding the focal length of a convex mirror?
A.
To approximate the principal focus
B.
To remove optical aberrations
C.
To ensure clear image formation
D.
To determine optical power
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ANSWER :
A. To approximate the principal focus
6.
What is the nature of the image formed by a convex mirror when using the parallax method?
A.
Real and inverted
B.
Virtual and erect
C.
Virtual and diminished
D.
Real and magnified
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ANSWER :
C. Virtual and diminished