Conceptual Questions Chap # 12 – Physics 10th

Human eye acts like____________

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

Example of Optical device is____________

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

The study of behavior of light is called___________

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

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

Optical center is represented by __________

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

Near point of a normal human being is______________

The distance between the optical center and the principal focus is__________

Endoscope which is used to diagnose throat is______

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

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

Long sightedness is caused due to __________ eye ball.

Mirror formula is____________

Regular reflection is reflection by the ________

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

A spherical mirror whose outer curved surface is reflecting is called_________

The angle between incident ray and normal N is__________

In lens number of curved surfaces at least _________

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

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

Which statement is correct about image formed by camera?

Long sightedness is removed by______

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 ?

The speed of light is greater in____________

Light enters the eye through transparent membrane called___________

Endoscope used to diagnose the stomach is_______

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

The working principle of photograph enlarger is the same as_____________

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

Image formed on a camera is _____________

According to law of refraction________

For a converging lens f is _______________

Which statement is correct about compound microscope?

Short sighted may be due to eyeball being ______________

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

Plank suggested that light consists of small packets of energy called_________

__________ have ability to move eye lens forward or backward.

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

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

Convex mirror produces images_____________

For seeing tiny objects, we use microscope of__________

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

Angle of incidence is represented by__________

Farsightedness is corrected by using___________

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 ______

Which statement is incorrect about concave mirror?

The nearsighted eye can be corrected by using_____________

No refraction occurs when the angle of incidence is ____________

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

I D = _________

• 1m^-1
• m^-2
• m^-3
• cm^-1

Which Option is Correct ?

SI unit of power of lens is___________

Power of concave lens is___________

Which statement is correct about convex mirror?

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

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

When object is at F the image is__________

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

Focal length of spherical mirror is ___________

The variation of focal length of eye lens is called___________

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

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

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

Lenses are used in optical devices__________

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

According to law of reflection___________

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

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

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

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

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 ?

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

Magnification of telescope can be determined by using formula___________

Lens thick at the center but thin at the edges is___________

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

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

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

_________has positive focal length

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

The index of refraction depends on _____________

In concave mirror the surface is reflecting_________