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


13.
How is the focal length of a convex lens estimated roughly before performing the parallax method?
A.
By measuring optical power
B.
By using a distant object
C.
By calculating from the refractive index
D.
By using a laser
😑 View Answer Rough Work Error
ANSWER :
B. By using a distant object
14.
What is the main advantage of the parallax method?
A.
It gives direct focal length
B.
It eliminates human error
C.
It is simpler
D.
It reduces parallax error
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ANSWER :
D. It reduces parallax error
15.
Which type of lens has a positive focal length?
A.
Concave lens
B.
None
C.
Cylindrical lens
D.
Convex lens
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ANSWER :
D. Convex lens
16.
Which type of mirror has a negative focal length?
A.
Convex mirror
B.
None
C.
Plane mirror
D.
Concave mirror
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ANSWER :
D. Concave mirror
17.
If an image moves in the opposite direction to the object in the parallax method, what does it indicate?
A.
Object is beyond the focal point
B.
Object is at the center of curvature
C.
Object is at the focal point
D.
Object is within the focal point
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ANSWER :
D. Object is within the focal point
18.
For a convex mirror, what is the relationship between the focal length (f) and the radius of curvature (R)?
A.
f = R
B.
f = R/4
C.
f = 2R
D.
f = R/2
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ANSWER :
D. f = R/2