Why Spherical over Parabolic

Q. Find the apparent depth and apparent shift of an object placed at the bottom of the a vessel containing a glass slab of thickness 10cm and water of height 50cm. as shown in the figure.

1. 50cm, 10cm
2. 44.17cm, 15.83cm
3. 42cm, 18cm
4. None of these

Q. If the side towards the centre of curvature is shining, then the type of mirror is:

1. Concave
2. Convex
3. Neither concave nor convex
4. Either concave or convex

Q. 24. Why caustic curves are formed in spherical aberration in spherical mirrors?

Q. Find the apparent depth and apparent shift of an object placed at the bottom of the a vessel containing a glass slab of thickness 10cm and water of height 50cm. as shown in the figure.

1. 50cm, 10cm
2. 44.17cm, 15.83cm
3. 42cm, 18cm
4. None of these

Q. If the separation between the two eyes of a man is d, what should be the minimum width of the mirror in which the man could see the full image of his face of width w, using both of his eyes.

1. $\frac{1}{2}(w+d)$
2. $(w-d)$
3. $\frac{1}{2}(w-d)$
4. $\frac{1}{2}w$

Q. A fish looking up through water sees the outside world contained in a circular horizon. If the refractive index of water is $\frac{4}{3}$ and the fish is 12 cm below the surface, the radius of this circle (in cm) is

1. $4\sqrt{5}$
2. $36\sqrt{5}$
3. $36\sqrt{7}$
4. $\frac{36}{\sqrt{7}}$