## Question

### Solution

Correct option is

θ2 decreases slightly

As θ1 increases, α also increases. So, (90 – α) decreases and hence θ2decreases. #### SIMILAR QUESTIONS

Q1

The focal length of an achromatic combination of two lenses is 60 cm. If the ratio of the dispersive powers of the two lenses is 5/3, then find out the focal length of the two lenses.

Q2

An achromatic combination of objective lens of a telescope is made of crown and flint glasses. Focal length of the combination is 0.25 meter. If the dispersive powers of crown and flint glasses are 0.02 and 0.03 respectively, then find the power of each lens of the combination.

Q3

A beam of light passes from medium 1 to medium 2 to medium 3 as shown in fig. What may be concluded about the three indices of refraction,n1n2 and n3? Q4

A ray of light in incident on a medium with angle of incidence i and refracted into a second medium with angle of refraction r. the graph of sin(i) vs sin (r) is shown in fig. Then, the velocity of light in the first medium in n times the velocity of light in the second medium. What should be the value of n? Q5

A beam of light propagates through a medium 1 and falls onto another medium 2, at an angle α1 as shown in fig. After that, in propagates in medium 2 at to an angle α2 as shown. The light’s wavelength in medium 1 is λ1. What  is the wavelength of light in medium 2? Q6

You are given two identical plano-convex lenses. When you place an object 20 cm to the left of a single plano-convex lens, the image appears 40 cm to the right of the lens. You then arrange the two plano-convex lenses back to back to form a double convex lens. If the object is 20 cm to the left of this new lens, what is the approximate location of the image? Q7

Light from a denser medium 1 passes to a rarer medium 2. When the angle of incidence is θ the partially reflected and refracted rays are mutually perpendicular. The critical angle will be

Q8

A man is walking under an inclined mirror at a constant velocity V ms–1along the X-axis. If the mirror is inclined at an angle θ with the horizontal, then what is the velocity of the image? Q9

Figure shows the graph of angle of deviation δ versus angle of incidence ifor a light ray striking a prism. The prism angle is Q10

A thin equiconvex lens (μ = 3/2) of focal length 10 cm is cut and separated and a material of refractive index 3 is filled between them. What is the focal length of the combination? 