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


7.
In a parallax experiment, an optical bench is used because:
A.
Just convention
B.
It is decorative
C.
It provides a graduated scale for accurately measuring distances of objects, mirrors, lenses, etc.
D.
It conducts heat
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ANSWER :
C. It provides a graduated scale for accurately measuring distances of objects, mirrors, lenses, etc.
8.
In the parallax method experiment, the parallax can be detected by:
A.
Adjusting brightness
B.
Smelling
C.
Moving the head/eye laterally and observing relative motion between needle and image
D.
Listening to sound
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ANSWER :
C. Moving the head/eye laterally and observing relative motion between needle and image
9.
Two pins/needles are commonly used in the parallax method because:
A.
One serves as object pin (in front of mirror/lens) and the other as image pin (to locate real image)
B.
Backup
C.
Aesthetics
D.
Just two are needed
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ANSWER :
A. One serves as object pin (in front of mirror/lens) and the other as image pin (to locate real image)
10.
When the object pin and image pin coincide (no parallax), the image is:
A.
At infinity
B.
At the mirror surface
C.
Formed at the position of the image pin (its position = image distance)
D.
Lost
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ANSWER :
C. Formed at the position of the image pin (its position = image distance)
11.
A concave mirror is a:
A.
Convex outward mirror
B.
Flat mirror
C.
Cylindrical mirror
D.
Spherical mirror with the reflecting surface on the inside (concave) of the sphere
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ANSWER :
D. Spherical mirror with the reflecting surface on the inside (concave) of the sphere
12.
The principal focus of a concave mirror is:
A.
Imaginary point only
B.
The pole
C.
The centre of curvature
D.
The point where parallel rays converge after reflection (real focus)
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ANSWER :
D. The point where parallel rays converge after reflection (real focus)