NEET 2023 | Optics Question 9 | Physics

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 :

$$f / 4$$

$$f / 2$$

Infinite

Zero

NEET 2022 Phase 2

MCQ (Single Correct Answer)

-1

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

secondary rainbow is due to single internal reflection and is formed above the primary one.

primary rainbow is due to double internal reflection and is formed above the secondary one.

primary rainbow is due to double internal reflection and is formed below the secondary one.

secondary rainbow is due to double internal reflection and is formed above the primary one.

NEET 2022 Phase 2

MCQ (Single Correct Answer)

-1

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

linear separation of the fringes decreases

angular separation of the fringes increases

angular separation of the fringes decreases

linear separation of the fringes increase

NEET 2022 Phase 2

MCQ (Single Correct Answer)

-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

$${{2I} \over 3}$$

$${I \over 2}$$

$${I \over 3}$$

$${{3I} \over 4}$$

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