1
NEET 2023
MCQ (Single Correct Answer)
+4
-1

Two thin lenses are of same focal lengths $$(f)$$, but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be :

A
$$f / 4$$
B
$$f / 2$$
C
Infinite
D
Zero
2
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

During a cloudy day, a primary and a secondary rainbow may be created, then the :

A
secondary rainbow is due to single internal reflection and is formed above the primary one.
B
primary rainbow is due to double internal reflection and is formed above the secondary one.
C
primary rainbow is due to double internal reflection and is formed below the secondary one.
D
secondary rainbow is due to double internal reflection and is formed above the primary one.
3
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

If the screen is moved away from the plane of the slits in a Young's double slit experiment, then the :

A
linear separation of the fringes decreases
B
angular separation of the fringes increases
C
angular separation of the fringes decreases
D
linear separation of the fringes increase
4
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

After passing through a polariser a linearly polarised light of intensity I is incident on an analyser making an angle of 30$$^\circ$$ with that of the polariser. The intensity of light emitted from the analyser will be

A
$${{2I} \over 3}$$
B
$${I \over 2}$$
C
$${I \over 3}$$
D
$${{3I} \over 4}$$
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