NEET Physics Question - Ray Optics

Assertion (A): When a glass prism is immersed in water, the deviation caused by prism decrease.

Reason (R): Refractive index of glass prism relative to water is less than relative to air.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Deviation is given by (delta = (mu-1)A), where (mu), is the relative refractive index. When immersed in water, (mu_{gw} = mu_g/mu_w), which is less than (mu_{ga} = mu_g), (refractive index w.r.t. air). A smaller (mu), leads to a smaller deviation. Both assertion and reason are true, and R correctly explains A.

Rankers Physics

Deviation of Prism in Water

Solution:

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