Short Questions Chap # 12 – Physics 10th

Which type of image is formed by a concave lens on a screen?

The distance from the pole to the principal focus measured along the principal axis is ____________

Regular reflection is reflection by the ________

Speed of light in air is approximately_________

• 3.0x10⁸ms^-1
• 4 x 10⁹ ms^-1
• 4 x 10¹⁴ ms^-1
• 3 x 10⁷ ms^-1

Which Option is Correct ?

Short sighted may be due to eyeball being ______________

When object is at F the image is__________

__________ have ability to move eye lens forward or backward.

The speed of light i in water is approximately __________

• 2.0 x 10⁸ ms^-1
• 2.3 x 10⁸ ms^-1
• 3 x 10⁸ ms^-1
• 3 x 10⁷ ms^-1

Which Option is Correct ?

In mirrors images are formed through reflection, but lenses form images through___________

Angle of incidence is represented by__________

A magnifying glass is a convex Lens which is used to produce magnified images of small objects. It is also called_______

For a converging lens f is _______________

The speed of light is greater in____________

The working principle of photograph enlarger is the same as_____________

The disability of the eye to form distinct images of nearby object on retina is called foresightedness or_______

Vertex is the midpoint of the curved surface of spherical mirror is also called____________

According to law of refraction________

Plank suggested that light consists of small packets of energy called_________

Which statement is incorrect about concave mirror?

Light enters the eye through transparent membrane called___________

I D = _________

• 1m^-1
• m^-2
• m^-3
• cm^-1

Which Option is Correct ?

If the object is on the right side of the lens then p is____________

Example of Optical device is____________

The angle between incident ray and normal N is__________

The distance between the optical center and the principal focus is__________

Optical center is represented by __________

(sin i / sin r ) = n = (n₂ / n₁) is called____________

The line passing through the two centers of curvatures of the lens is called____________

An object 14cm in front of a convex mirror. The image is 5.8cm behind the mirror. What is focal length of the mirror.

In case of photograph enlarger, the object is placed at distance____________

Mirror formula is____________

It is used to explore the interior organs of the body?

The incident ray, the normal, and the reflected ray at the point of incidence all lie in the_______

Which pipe is a bundle of thousands of optical fibers bounded together?

Which statement is correct about image formed by camera?

Endoscope used to diagnose the stomach is_______

Which of the following quantities is not changed during refraction of light?

The angle of incidence that causes the refracted ray in the rarer medium to bend through 90° is called_______

Image formed on a camera is _____________

In concave mirror the surface is reflecting_________

Which type of image is produced by the converging lens of human eye if it views a distant object?

No refraction occurs when the angle of incidence is ____________

Focal length of spherical mirror is ___________

Near point of a normal human being is______________

The variation of focal length of eye lens is called___________

The rough surfaces of object reflect the rays of light in many directions is called____________

For a concave lens, the parallel rays appear to come from a point behind the lens is called________

Human eye acts like____________

In lens number of curved surfaces at least _________

The relationship between object distance p, image distance q from the mirror and focal length of the mirror is called____________

Farsightedness is corrected by using___________

The image with convex lens is formed at 2F, real inverted, the same size as the object when the object is placed at____________

The colored portion of eye controls the amount of light reaching the retina ______

Long sightedness is removed by______

The index of refraction depends on _____________

SI unit of power of lens is___________

A spherical mirror whose outer curved surface is reflecting is called_________

Which statement is correct about compound microscope?

For seeing tiny objects, we use microscope of__________

A line joining center of curvature and pole of the spherical mirror is_______

A converging mirror with a radius of 20cm creates a real image 20cm from the mirror. What is the object distance?

Which statement is correct about convex mirror?

The bending of light as it passes from one transparent medium into another is___________

According to law of reflection___________

Lenses are used in optical devices__________

_________has positive focal length

The critical angle for a beam of light passing form water into air is 48.8 digress. This mean that all light rays with an angle of incidence greater than this angle will be ______

When people cannot see distant objects clearly without the aid of spectacles the defect of vision is_____

It is a transparent body (made of optical glass) with at least two polished Elsie faces inclined towards each other from which light is refracted_______

The angle between the normal and the reflected ray is called angle of________

If a ray of light in glass is incident on air surface at an angle greater than the critical angel, the ray will___________

When a ray of light enters from a denser medium to a rarer medium __________

Convex mirror produces images_____________

It is an optical instrument which is used to observe distant objects using lens or mirror________

Magnification of telescope can be determined by using formula___________

Long sightedness is caused due to __________ eye ball.

The study of behavior of light is called___________

The lens which causes incident parallel rays to converge at a point is___________

Endoscope which is used to diagnose throat is______

Power of concave lens is___________

Lens thick at the center but thin at the edges is___________

An object is placed at the center of curvature of a concave mirror. The image produced by the mirror is located__________

In case of convex lens when object is placed beyond 2F, the image is formed___________

The nearsighted eye can be corrected by using_____________