26.A convex lens is thicker in the middle than at the edges. This causes rays of light to converge.
27.refractionThe phenomenon of refraction, the bending of light in water or glass, can be explained by the fact that light waves travel at different speeds in different materials. The phenomenon of refraction can be seen when looking at a straight straw placed in a glass of water.
28.Tyndall Effect The phenomenon of scattering of light by dust, particles, smoke and water droplets suspended in air in colloidal form is known as “Tyndall effect” or “Tyndall Scattering
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Answer:
26.A convex lens is thicker in the middle than at the edges. This causes rays of light to converge.
27.refraction The phenomenon of refraction, the bending of light in water or glass, can be explained by the fact that light waves travel at different speeds in different materials. The phenomenon of refraction can be seen when looking at a straight straw placed in a glass of water.
28.Tyndall Effect The phenomenon of scattering of light by dust, particles, smoke and water droplets suspended in air in colloidal form is known as “Tyndall effect” or “Tyndall Scattering