# Suppose that the lower half of the concave mirror’s reflecting surface in the given figure is covered with an opaque (non-reflective) material. What effect will this have on the image of an object placed in front of the mirror?              1. the image will show only half of the object 2. the image will show the whole of the object 3. the intensity of the image will be low 4. both (2) and (3)

Subtopic:  Reflection at Spherical Surface |
76%
From NCERT
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A mobile phone lies along the principal axis of a concave mirror, as shown in the figure. Then,

 1 the magnification is not uniform due to the length of the object along the principal axis. 2 the distortion of the image depends on the location of the phone with respect to the mirror. 3 both (1) and (2) 4 none of these

Subtopic:  Reflection at Spherical Surface |
85%
From NCERT
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An object is placed at $$10$$ cm in front of a concave mirror with a radius of curvature of $$15$$ cm. The magnification of the image is:
1. $$-3$$
2. $$3$$
3. $$1$$
4. $$-1$$

Subtopic:  Reflection at Spherical Surface |
74%
From NCERT
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An object is placed at $$5$$ cm in front of a concave mirror with a radius of curvature of $$15$$ cm. The nature of the image is:
1. magnified, real, and inverted
2. magnified, virtual, and erect
3. magnified, real, and erect
4. none of these

Subtopic:  Reflection at Spherical Surface |
73%
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Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of $$R= 2~\text{m}$$. If the jogger is running at a speed of $$5~\text{m/s}$$, how fast does the image of the jogger appear to move when the jogger is $$39~\text{m}$$ away?
1. $$5~\text{m/s}$$

2. $$\frac{1}{60}~\text{m/s}$$
3. $$\frac{1}{280}~\text{m/s}$$
4. $$10~\text{m/s}$$

Subtopic:  Reflection at Spherical Surface |
56%
From NCERT
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The earth takes $$24~\text{h}$$ to rotate once about its axis. How much time does the sun take to shift by $$1^{\circ}$$ when viewed from the earth?
1. $$3~\text{minutes}$$

2. $$2~\text{minutes}$$

3. $$1~\text{minutes}$$

4. $$4~\text{minutes}$$

Subtopic:  Refraction at Curved Surface |
60%
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Light from a point source in the air falls on a convex spherical glass surface (n = 1.5 and radius of curvature = 20 cm) of a glass medium which extends till infinity on other side . The distance of the light source from the glass surface is 100 cm. At what position the image is formed?

 1 at a distance of 200 cm from the glass surface, in the direction of incident light. 2 at a distance of 100 cm from the glass surface, in the direction of incident light. 3 at a distance of 200 cm from the glass surface, in the opposite direction of incident light. 4 at a distance of 100 cm from the glass surface, in the opposite direction of incident light.

Subtopic:  Refraction at Curved Surface |
66%
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A magician during a show makes a glass lens with $$n=1.47$$ disappear in a trough of liquid. What is the refractive index of the liquid?
1. $$1.47$$
2. $$1.33$$
3. $$0.66$$
4. $$1.5$$

Subtopic:  Refraction at Curved Surface |
78%
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If $$f=0.5$$ m for a glass lens, what is the power of the lens?
1. $$+0.4$$ D
2. $$+4.0$$ D
3. $$+0.2$$ D
4. $$+2.0$$ D

Subtopic:  Lenses |
86%
From NCERT
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The radii of curvature of the faces of a double convex lens are $$10$$ cm and $$15$$ cm. Its focal length is $$12$$ cm. What is the refractive index of glass?
1. $$1.3$$
2. $$1.2$$
3. $$1.5$$
4. $$1.4$$

Subtopic:  Lenses |
81%
From NCERT
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