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.
How is the focal length of a concave mirror determined using the parallax method?
A.
By focusing parallel rays
B.
By aligning a needle at focus
C.
By using a lens formula
D.
By measuring image size variation
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ANSWER :
B. By aligning a needle at focus
8.
In the parallax method, what does it mean if the image moves in the same direction as the object?
A.
The image is at the focal point
B.
The object is beyond twice the focal length
C.
The object is inside the focal point
D.
The object is very far away
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ANSWER :
D. The object is very far away
9.
What is the relation between object distance (u), image distance (v), and focal length (f) for a spherical mirror?
A.
1/f = u + v
B.
1/f = 1/u - 1/v
C.
1/f = u - v
D.
1/f = 1/v - 1/u
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ANSWER :
B. 1/f = 1/u - 1/v
10.
Why is a needle or pin used in the parallax method?
A.
To measure distance
B.
To observe image quality
C.
To create optical illusion
D.
To align the optical axis
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ANSWER :
B. To observe image quality
11.
Which mirror always forms a virtual, diminished, and erect image for any object position?
A.
Concave mirror
B.
Convex mirror
C.
Plane mirror
D.
Cylindrical mirror
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ANSWER :
B. Convex mirror
12.
In the parallax method for a convex lens, what happens when the object and image coincide?
A.
Focal length is infinite
B.
Parallax is eliminated
C.
No parallax is observed
D.
Image is at infinity
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ANSWER :
B. Parallax is eliminated