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A wire is bent in the shape of a right angled triangle and is placed in front of a concave mirror of focal length $f$ , as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)

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Important Questions on Ray Optics

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 3>Q 34

A student measures the focal length of a convex lens by putting an object pin at a distance

u

from the lens and measuring the distance

v

of the image pin. The graph between

u

and

v

plotted by the student should look like

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 3>Q 35

A transparent solid cylindrical rod has a refractive index of $\frac{2}{\sqrt{3}}$ . It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure.

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 3>Q 36

A car is fitted with a convex side view mirror of focal length

20 cm

. A second car

2.8 m

behind the first car is overtaking the first car is a relative speed of

15 m s^{- 1}

. The speed of the image of the second car as seen in the mirror of the first one is

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 3>Q 37

Let the

x - y

plane be the boundary between two transparent media. Medium

1

z \geq 0

has a refractive index of

\sqrt{2}

and medium,

2

with

z < 0

has a refractive index of

\sqrt{3}

. A ray of light in medium

1

given by the vector

\vec{A} = 6 \sqrt{3} \hat{i} + 8 \sqrt{3} \hat{j} - 10 \hat{k}

in an incident on the plane of separation. The angle of refraction in the medium

2

is:

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 3>Q 38

A beaker contains water upto a height

h_{1}

and kerosene of height

h_{2}

above water so that the total height of the (water + kerosene) is

h_{1} + h_{2}

. Refractive index of water is

μ_{1}

and that of kerosene is

μ_{2}

. The apparent shift in the position of the bottom of the beaker when viewed from above is

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 3>Q 39

When monochromatic red light is used instead of blue light in a convex lens, its focal length will

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 3>Q 40

An object

2.4 m

in front of a lens forms a sharp image on a film

12 cm

behind the lens. A glass plate

1 cm

thick of refractive index

1.50

is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film?

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 3>Q 41

The diameter of a plano-convex lens is

6 cm

and thickness at the centre is

3 mm

. If the speed of light in the material of the lens is,

2 \times 10^{8} m s^{- 1}

, the focal length of the lens is:

A wire is bent in the shape of a right angled triangle and is placed in front of a concave mirror of focal length f, as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)

Important Questions on Ray Optics

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A wire is bent in the shape of a right angled triangle and is placed in front of a concave mirror of focal length $f$ , as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)