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qUESTIONS

Two wires of equal diameters, of resistivities P1 and P2 and lengths 1 and 2, respectively, are joined in series. The equivalent resistivity of the combination is

For what value of R the net resistance of the circuit will be 18ohm

The effective resistance across the points A and I is

The equivalent resistance between the points A and B in the following circuit is

The equivalent resistance between points A and B with switch S open and closed are respectively

MCQs-PYQs-12th-jee

The eye can be regarded as a single refracting surface. The radius of this surface is equal to that of cornea (7.8 mm). This surface separates two media of refractive indices 1 and 1.34. Calculate the distance from the refracting surface at which a parallel beam of light will come to focus.

MCQs-PYQs-12th-jee

A plano convex lens of refractive index µ1 and focal length f1 is kept in contact with another plano concave lens of refractive index µ2 and focal length f2 . If the radius of curvature of their spherical faces is R each and f1 = 2f2 , then µ1 and µ2 are related as

MCQs-PYQs-12th-jee

Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror (M1) and parallel to the second mirror (M2) is finally reflected from the second mirror (M1) parallel to the two mirrors will be :

MCQs-PYQs-12th-jee

A convex lens is put 10cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is :

MCQs-PYQs-12th-jee

A parallel beam of light is incident from air at an angle α 𝛼 on the side of right angled triangular prism of refractive index μ = √2 𝜇 = 2 . Light undergoes total internal reflection in the prism at the face 𝑃𝑅 when 𝛼 has a minimum value of 45. The angle θ 𝜃 of the prism is.

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