A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let O be the pole of the mirror and C is its centre of curvature. A point object is placed at C. It has a real image, also located at C. If the mirror is now filled with water, the image will be :

1. Real, and will remain at *C*

2. Real, and located at a point between *C* and $\infty $

3. Virtual and located at a point between *C* and *O*

4. Real, and located at a point between *C* and *O*

Concept Questions :-

Reflection at spherical surface

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We wish to see inside an atom. Assuming the atom to have a diameter of *100 pm*, this means that one must be able to resolved a width of say *10 p.m.* If an electron microscope is used, the minimum electron energy required is about

(a)* 1.5 KeV* (b) *15 KeV*

(c)* 150 KeV * (d) *1.5 KeV*

Concept Questions :-

Resolution of Optical devices

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A telescope has an objective lens of *10 cm* diameter and is situated at a distance of one kilometre from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å, is of the order of

(a)* 0.5 m *(b) *5 m*

(c) *5 mm* (d) *5 cm*

Concept Questions :-

Resolution of Optical devices

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Two point white dots are *1mm* apart on a black paper. They are viewed by eye of pupil diameter 3 *mm*. Approximately, what is the maximum distance at which dots can be resolved by the eye ? [Take wavelength of light = *500 nm*]

(a) *6 m* (b) *3 m*

(c) *5 m* (d) *1 m*

Concept Questions :-

Human eye

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A room (cubical) is made of mirrors. An insect is moving along the diagonal on the floor such that the velocity of image of insect on two adjacent wall mirrors is $10cm{s}^{-1}$. The velocity of image of insect in ceiling mirror is

(a) 10 $cm{s}^{-1}$ (b) 20 $cm{s}^{-1}$

(c) $\frac{10}{\sqrt{2}}cm{s}^{-1}$ (d) $10\sqrt{2}cm{s}^{-1}$

Concept Questions :-

Reflection at plane surface

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Figure shows a cubical room *ABCD* with the wall *CD* as a plane mirror. Each side of the room is *3m*. We place a camera at the midpoint of the wall *AB*. At what distance should the camera be focussed to photograph an object placed at *A *

(a) *1.5 m * (b) *3 m*

(c) *6 m* (d) More than* 6 m*

Concept Questions :-

Reflection at plane surface

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If an object moves towards a plane mirror with a speed v at an angle $\theta $ to the perpendicular to the plane of the mirror, find the relative velocity between the object and the image

(a) *v* (b) *2v*

(c)* 2v cos $\theta $* (d) *2v sin* $\theta $

Concept Questions :-

Reflection at plane surface

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A plane mirror is placed at the bottom of the tank containing a liquid of refractive index $\mu $. *P* is a small object at a height *h* above the mirror. An observer *O *vertically above *P* outside the liquid sees *P* and its image in the mirror. The apparent distance between these two will be-

1. $2\mu h$

2. $\frac{2h}{\mu}$

3. $\frac{2h}{\mu -1}$

4. $h\left(1+\frac{1}{\mu}\right)$

Concept Questions :-

Refraction at plane surface

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A thin prism having refracting angle ${10}^{\xb0}$ is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be

(a)${4}^{\xb0}$

(b)${6}^{\xb0}$

(c)${8}^{\xb0}$

(d)${10}^{\xb0}$

NEET - 2017

Concept Questions :-

Prisms

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A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle $\theta $, the spot of light is found to move through a distance y on the scale. The angle $\theta $ is given by

(a) $\frac{y}{2x}$

(b) $\frac{y}{x}$

(c) $\frac{x}{2y}$

(d) $\frac{x}{y}$

NEET - 2017

Concept Questions :-

Reflection at plane surface

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