(a) A mixture of red, blue and green light rays is passed through a convex lens, as illustrated in the diagram below. State whether the ray passes through a single point or through different points on the principal axis after refraction.
(b) Name the invisible radiation which is studied using the quartz prism.
(c) State one use of the radiation mentioned by you in (b) above.
(d) Name one type of radiation with a wavelength greater than that of the radiation mentioned by you in (b) above.
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(a) The ray will pass through different points on principal axis after refraction through the convex lens as the refractive index of a medium decreases with the increase in wavelength so red colour will deviate the least, followed by green and then blue will deviate the most.
(b) Ultraviolet radiations.
(c) Ultraviolet radiations are used for sterilizing air, surgical equipment, etc.
(d) Infrared radiation.