JEE Main 2021 (Online) 17th March Morning Shift | Geometrical Optics Question 105 | Physics

The thickness at the centre of a plane convex lens is 3 mm and the diameter is 6 cm. If the speed of light in the material of the lens is 2 $$\times$$ 10⁸ ms^$$-$$1. The focal length of the lens is ____________.

0.30 cm

30 cm

15 cm

1.5 cm

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

The refractive index of a converging lens is 1.4. What will be the focal length of this lens if it is placed in a medium of same refractive index? Assume the radii of curvature of the faces of lens are R₁ and R₂ respectively.

Zero

Infinite

$${{{R_1}{R_2}} \over {{R_1} - {R_2}}}$$

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

Red light differs from blue light as they have :

Different frequencies and same wavelengths

Different frequencies and different wavelengths

Same frequencies and different wavelengths

Same frequencies and same wavelengths

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

The angle of deviation through a prism is minimum when

JEE Main 2021 (Online) 16th March Morning Shift Physics - Geometrical Optics Question 109 English

JEE Main 2021 (Online) 16th March Morning Shift Physics - Geometrical Optics Question 109 English

(A) Incident ray and emergent ray are symmetric to the prism.

(B) The refracted ray inside the prism becomes parallel to its base

(C) Angle of incidence is equal to that of the angle of emergence

(D) When angle of emergence is double the angle of incidence

Choose the correct answer from the options given below :

Statements (B) and (C) are true

Only statements (A) and (B) are true

Statements (A), (B) and (C) are true

Only statement (D) is true

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