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?
None of these
R = 10 cm
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.
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,n1, n2 and n3?
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?
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?
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?
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
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?
Figure shows the graph of angle of deviation δ versus angle of incidence ifor a light ray striking a prism. The prism angle is
Light is incident on a glass block as shown in fig. If θ1 is increased slightly, what happens to θ2?
Behind a thin converging lens having both the surfaces of the same radius 1 cm, a plane mirror has been placed. The image of an object at a distance of 40 cm from the lens is formed at the same position. What is the refractive index of the lens?