is due to the constituent colours of the light incident on them. A monochromatic light may produce an entirely different perception about the colours on an object as seen in white light. . For a simple microscope, the angular size of the object equals the angular size of the image.
Yet it offers magnification because we can keep the small object much closer to the eye than cm and hence have it subtend a large angle. The image is at cm which we can see. Without the microscope, you would need to keep the small object at cm which would subtend a very small angle. FIGURE .
. A small bulb is placed at the bottom of a tank containing water to a depth of 80cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is .
. (Consider the bulb to be a point source.) . A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism.
The angle of minimum deviation is measured to be °. What is the refractive index of the material of the prism? The refracting angle of the prism is °. If the prism is placed in water (refractive index .
), predict the new angle of minimum deviation of a parallel beam of light. . Double-convex lenses are to be manufactured from a glass of refractive index . , with both faces of the same radius of curvature.
What is the radius of curvature required if the focal length is to be 20cm? . A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P.
At what point does the beam converge if the lens is (a) a convex lens of focal length 20cm, and (b) a concave lens of focal length 16cm? . An object of size .0cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the