Physics
(a) Mixture of red + blue + green is passed through a convex lens as shown 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 radiations which are studied using the quartz prism.
(c) State one use of these radiations.
(d) Name one radiation having the wavelength longer than the wavelength of these radiations.
Refraction Lens
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Answer
(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.
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