1 1 1 n, sin60, -n, singl n- p f 1. A diffraction grating is illuminated by a hy

Question

1 1 1 n, sin60, -n, singl n- p f 1. A diffraction grating is illuminated by a hydrogen lamp that has both red (656 nm) and violet (434 nm) lines in its spectrum. In the second order spectrum observed on the screen, which color is closer to the central maximum? (a) red (b) violet (c) both are at the same location. 2. Total internal reflection happens (a) when the incident light strikes the medium boundary at 90. (b) when the incident light strikes the medium boundary at an angle greater than the critical angle. (c) when the incident light strikes the medium boundary at an angle less than the critical angle. (d) when the incident light strikes the medium boundary at a glancing angle. (e) There is no such thing as total internal reflection. 3. When the ray in the diagram is continued through the diverging lens, it passes through which point? The two points labeled 'F' are the two focal points. The ray shown is directed towards the focal point F. (a) A (b) B (c) C (d) D (e) E Questions 4 and 5: An object O is placed in front of a diverging lens as shown in the figure. In the figure F marks the focal points, and 2F marks a distance twice the focal length. (If you cannot think of the answer, it may help to draw a proper roughly to scale, not random) ray diagram on a piece of paper and look at it carefully.) 4. The image formed is (a) virtual, inverted, and magnified. (b) real, upright, and magnified. (c) diminished, upright, and virtual. (d) magnified, inverted, and real. (e) diminished, real, and upright.

Explanation / Answer

PART A)

lesses wavelength will be closer

so VIOLET will be closer

PART 2)

When incident angle is more than critical angle then total internal reflection occurs

Option B)

PART 3)

When light is moving towards focus then it willbecome parallel after passing lens

So it will move towards "B"

PART 4)

For concave lens the image is always

Diminished, upright, virtual

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