1
KCET 2023
+1
-0

When light propagates through a given homogeneous medium, the velocities of

A
primary wavefront are larger than those of secondary wavelets.
B
primary wavefronts are lesser than those of secondary wavelets.
C
primary wavefronts are greater than or equal to those of secondary wavelets.
D
primary wavefront and wavelets are equal.
2
KCET 2023
+1
-0

An unpolarised light of intensity $$I$$ is passed through two polaroids kept one after the other with their planes parallel to each other. The intensity of light emerging from second polaroid is $$\frac{I}{4}$$. The angle between the pass axes of the polaroids is

A
$$45^{\circ}$$
B
$$0^{\circ}$$
C
$$60^{\circ}$$
D
$$30^{\circ}$$
3
KCET 2023
+1
-0

In the Young's double slit experiment, the intensity of light passing through each of the two double slits is $$2 \times 10^{-2} \mathrm{~Wm}^{-2}$$. The screen-slit distance is very large in comparison with slit-slit distance. The fringe width is $$\beta$$. The distance between the central maximum and a point $$P$$ on the screen is $$x=\frac{\beta}{3}$$. Then, the total light intensity at the point is

A
$$8 \times 10^{-2} \mathrm{~Wm}^{-2}$$
B
$$4 \times 10^{-2} \mathrm{~Wm}^{-2}$$
C
$$2 \times 10^{-2} \mathrm{~Wm}^{-2}$$
D
$$16 \times 10^{-2} \mathrm{~Wm}^{-2}$$
4
KCET 2022
+1
-0

For light diverging from a finite point source,

A
the intensity decreases in proportion to the distance squared
B
the wavefront is parabolic
C
the intensity at the wave front does not depend on the distance
D
the wave front is cylindrical
EXAM MAP
Medical
NEET