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Q1.

Angle of minimum deviation is equal to the half of the angle of prism in an equilateral prism. The refractive index of the prism is __________.

(A)

$1.5$

(B)

$\sqrt{3}$

(C)

$\sqrt{2}$

(D)

$1.65$

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Q2.

A thin convex lens and a thin concave lens are kept in contact and are co-axial. Which of the following statements is correct for this combination of two lenses ?

(A)

behaves as concave lens if $|f_{\text{convex}}| \gt |f_{\text{concave}}|$

(B)

behaves as concave lens if $|f_{\text{convex}}| \lt |f_{\text{concave}}|$

(C)

behaves as convex lens if $|f_{\text{convex}}| \gt |f_{\text{concave}}|$

(D)

Focal length of the lens system will change if the positions of two lenses are interchanged

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