To produce a large amount of bending, the light ray has to enter the glass with a large angle of incidence.
For no refraction, the light ray has to enter the glass perpendicularly.
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What is observed when 2mL of dilute hydrochloric acid is added to 1g of sodium carbonate taken in a clean and dry test tube? Write chemical equation for the reaction involved.
An object is placed at a distance of 15 cm from a concave lens of focal length 30 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.
Light travels through air at 300 million $ms ^{-1}$. On entering water it slows down to 225 million $ms ^{-1}$. Calculate the refractive index of water.