The angle of incidence when a light ray reflects back along the same path is 30°. $$True\ or\ False$$

$$False$$ When a light ray strikes a surface perpendicularly (along the normal), the angle of incidence is 0°, and it reflects directly back.

The image formed by a plane mirror is virtual, erect, and of the same size as the object. $$True\ or\ False$$

$$True$$ The image cannot be obtained on a screen (virtual), is upright (erect), and the distance from the mirror to the object equals the distance from the mirror to the image.

When a light ray reflects from a plane mirror, the the angle of incidence ........... the angle of reflection $$<$$ $$>$$ $$=$$

$$=$$ This is the first law of reflection. The incident ray, reflected ray, and the normal all lie in the same plane.

Concave mirror is used as a side/rear-view mirror in vehicles. $$True\ or\ False$$

$$False.$$ A convex mirror always gives a diminished, erect, and wider field of view, which helps the driver see more traffic area behind him.

An object placed in front of a concave mirror to get a real, inverted, and highly magnified image is placed between the Focus (F) and the Center of Curvature (C). $$True\ or\ False$$

$$True$$ When the object is placed between F and C, the image is formed beyond C. It is real, inverted, and enlarged.

The nature of the image formed by a concave mirror when the object is placed at its focus (F) is real, inverted, and highly magnified at infinity. $$True\ or\ False.$$

$$True.$$ The reflected rays become parallel and do not meet. We say the image is formed at infinity and is highly magnified.

The SI unit of power of a lens is______

Dioptre (D). The power of a lens (P) is defined as the reciprocal of its focal length in meters: P = 1/f (where f is in meters).

The power of a convex lens is_____

Positive (+ve). A convex lens converges light rays. By convention, the focal length of a converging lens is taken as positive, so its power is also positive.

The power of a concave lens is____

Negative (-ve). A concave lens diverges light rays. The focal length of a diverging lens is taken as negative, so its power is also negative.

The lens used to correct myopia (short-sightedness) is______

Concave Lens (Diverging lens). A myopic eye focuses images in front of the retina. A concave lens diverges the light rays before they enter the eye, helping the image form correctly on the retina.

The lens used to correct hypermetropia (long-sightedness) is_____

Convex Lens (Converging lens). A hypermetropic eye focuses images behind the retina. A convex lens converges the light rays before they enter the eye, helping the image form correctly on the retina.

The speed of light in a vacuum is___

3 x 10⁸ m/s. This is the maximum possible speed at which light and all information in the universe can travel.

A light ray bending towards the normal means it traveled from a rarer medium to a denser medium. $$True\ or\ False.$$

$$True.$$ Example: Light traveling from air (rarer) into glass (denser). The speed of light decreases in a denser medium, causing it to bend towards the normal.

The ratio of the speed of light in a vacuum to its speed in a medium is called_____

Refractive Index. Refractive Index (n) = Speed of light in vacuum (c) / Speed of light in medium (v). It is a dimensionless number that indicates how much the medium bends light.

The value of the refractive index of a vacuum is $$\frac{3}{2}$$ $$True\ or\ False.$$

$$False$$ In a vacuum , light travels at its maximum possible speed , $$\mu=\frac{c}{c}=1$$

When an object is placed at the center of curvature (C) of a concave mirror the image is formed at focal point. $$True\ or\ False$$

$$False$$ The image is formed at the center of curvature (C) itself and is real, inverted, and of the same size as the object.

The relation between the radius of curvature (R) and the focal length (F) of a spherical mirror is______

F = R/2 The focal length is half the radius of curvature. The focus (F) is the midpoint of the pole (P) and the centre of curvature (C).

The type of image formed by a convex mirror is virtual, erect, and diminished. $$True\ or\ False$$

$$True$$ Regardless of the object's position, a convex mirror always forms an image that appears to be behind the mirror, is upright, and smaller than the object.

The cause of the twinkling of stars is_____

Atmospheric refraction The light from stars refracts (bends) multiple times through different layers of the Earth's atmosphere, which has varying densities. This causes the apparent position and brightness of the star to fluctuate.

FC-CBSE-10-S-C9 Flashcards

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1.

FLASHCARD QUESTION

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2.

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3.

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4.

FLASHCARD QUESTION

Front

The focal length of a plane mirror is_____

Back

Infinite (∞)

A plane mirror does not converge or diverge light.

The reflected rays appear to come from a point infinitely far behind the mirror.

5.

FLASHCARD QUESTION

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6.

FLASHCARD QUESTION

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7.

FLASHCARD QUESTION

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