An owl can see clearly at night but not day time because it has - More rods and few cones
Part of the eye which controls the light entering is called - Iris
We can see a non-luminous object when light: - is reflected from the object towards our eye.
The impression of sensation remains on the retania for about may secounds after removal of the object - 1/16th of a sec
the cells present in the retina of eye and responding to intensity of low light are: - Rod - shaped cells
The cells present in the retina of eye and responding to color are: - Cones
The disease of eye in which crystalline lens becomes hazy or even opaque due to development of membrane over it is : - Cataract
Image formed by a plane mirror is: - Virtual, Behind the mirror and of same size as the object
The angle between incident ray and normal is called the called the angle of: - Incidence
The lens present in eyes is: - Convex lens
Kaledioscope is based on the pattern of: - Multiple reflection
When 2 mirrors are placed parallel to each other, and a candle is place in the center of the mirror no. of images will be formed. - Infinity
The difference in the color of the eye is due to difference in: - Iris
Band of seven colours is called: - VIBGYOR
Rainbow is formed after rain due to - Dispersion
The focal lenght of the eye-lens is changed by: - Ciliary Muscles
Far point of a normal human eye is situated at: - Infinity
The least distance of distinct vision for a young adult with normal vision is: - 25 cm
As the angle between 2 plane mirrors is decreased gradually, the no. of images of an object placed between them: - Increases gradually
A person who cannot see the near by object is said to be suffering from: - Hypermetropia
Light travel fastest in - Air
The mirror having reflection surface curved outward - convex mirror
The mirror having reflecting surface curved inwards - concave mirror
The mirror used as rear-view mirror in vehicles - convex mirror
The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called - refraction
According to laws of reflection, the angle of incidence is equal to angle of …………….. - equal
When rays of light after reflection meet a point ………….. image is formed. - real
When light falls on a surface and bounces back to the medium, the phenomena is called …………….. - reflaction
Which statement is true for the reflection of light? - The angle of incidence and reflection are equal.
Focal length of a plane mirror is - infinite
A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is : - convergent
An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and image will be - 0.5 m
The angle of incidence for a ray of light having zero . Than reflection angle is - 0
Image formed by plane mirror is - Virtual and erect
When a ray is travelling from a rarer medium to the denser medium, the ray will move away from the normal. - false
Which of the following is the correct statement? - The angle between the incident ray and the normal is known as the angle of incidence.
Light is a .................wave. - Electromagnetic
Light behaves like a particles as well as wave. - True
A particle of light is called ......... - Photon
The speed of light in air or vacuum is............ - 300000Km/s
Under which of the following conditions a concave mirror can form an image larger than the actual object? - When object is placed between the focus and centre of curvature
Magnification produced by a rear view mirror fitted in vehicles - is less than one
Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object? - 30 cm in front of the mirror
A full length image of a distant tall building can definitely be seen by using - a convex mirror
In torches, search lights and headlights of vehicles the bulb is placed - very near to the focus of the reflector
A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top. - Concave, plane and convex
The image which is formed behind the mirror - virtual image
……………. is ratio of height of image to height of object. - Magnification
An object is placed at 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is: - More than 200 mm
Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used? - 10 cm
A concave mirror produces a magnification of +4. The object is placed: - Between focus and pole
Distance measured perpendicular to and below the principle axis are taken as _______. - Negative
Focal length of convex mirror is taken as _________. - Positive
All the distances measured to the left of origin/pole of the spherical mirror are taken as _______. - Negative
Distance measuredperpendicular to and above the principal axis are taken as ________. - Positive
