Physics - Light
and has small apex angle 20 i.e., small angle approximations are valid sinα ≡ α and sin (α + β) = α + β, where α and β are angles. The final image is 
) = 280 26'. The beam emerges from the face 
. Take the approximation sinθ ≡ θ and casθ ≡ 1 where θ is angle and consider the rays close to a diameter of the bubble. Use the following formula to solve the problem 
(see figure)
R
R
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