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Syllabus

write 3 difference between concave and convex lens?

write 3 differences between real and virtual images?

What is meant by lateral displacement?

What is the meaning of virtual and erect image???derivation of mirror formula as well as lens formula ?

define power of lens and gives its S.I.unit

State the Principle of reversibility of light

explain..why a pencil partly immersed in water appears to be bent at the water surface

what is tyndall effect?

define absolute refractive index of a medium.?

WHAT IS VIRTUAL AND ERECT IMAGE

One half of a convex lens is covered with a black paper.will such a lens produce an image of the complete object?support your answer with a ray diagram.

plz ans. fast as i hv a revision test on monday

write 3 differences between reflection and refraction

an object is placed at a distance of 10 cm from a convex mirror of focal length 15cm. find the position and nature of the image.

refractive index of glass with respect to air is 3/2..refractive index of water with respect to air is 4/3..what is the refractive index of glass with respect to water?? is it 3/2 divided by4/3 or 4/3 divided by 3/2??

a student focused the image of the candle flame on a white screen using a convex lens .He noted down the positions of the candle flame , screen and the lens as given below

position of candle flame = 12 cm

position of the lens= 50 cm

position of the screen = 88cm

Q 1 find the focal length of the convex lens.

Q 2 Find the position of the image of the candle flame if it is shifted towards the lens at a position of 31cm

Q3 State the nature of the image formned if the candle flame is further shifetd towards the lens..

this is a 10th board question n i m nt able 2 solve it plz helppppp

the history of spherical mirrors in human civilization

What will happen to the focal length if the convex lens is dip inside the water.

the refractive index of diamond is 2.42 what is the meaning of this statement?

what is a focal length of plane mirror

Q1. A concave lens has focal length 20cm.

At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens?

Also calculate the size of the

image formed.

Q2. A convex lens has a focal length of 30 cm. Calculate at what distance should the object be placed from the lens so that it forms an image at 60 cm on the other side of the lens?. Find the magnification produced by the lens in this case.

Name the type of mirror used in the following situations.

(a) Headlights of a car

(b) Side/rear-view mirror of a vehicle

(c) Solar furnace

Support your answer with reason.

a concave mirror produces 3 times enlarged image of an object placed at 10 cm in front of it.Calculate radius of curvature of mirror

state snells law of refraction.

Define principal focus of a lens ?

Derive lens formula, that is 1/v - 1/u = 1/f

what will be your observation,when an object placed in front of concave mirror,is moving towards the pole of the mirror?

The refractive index of water is 4/3 and for glass is 3/2 w.r.t air. What is the refractive index of glass w.r.t. water?define principal focus of a

Convex lens and Concave lensdefine the principal focus of a convex mirror

What is tyndall effect?Explain an example

A concave mirror produces three times magnified real image of an object placed 10 cm in front of it.Where is the image located

DEFINE RARER & DENSER MEDIUM.

why a convex mirror is used as rear view mirror

A student focussed the image of a candle flame

When an object is placed at a distance of 50 cm from a concave mirror , the magnification produced is - 1/2 . where should the object be placed to get a magnification of -1/5

The magnification produced by a plane mirror is +1. What does this mean?

a convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens if the image size is equal to the object size. Also find the power of the lens

The refractive indices of water and glass with respect to air are 4/3 and 3/2 respectively. If the speed of light in glass is 2x 10

^{8}ms^{-1, }find the speed of light in1. Air

2. Water

what r the properties of convex and concave mirror???

rnDefine power of lens.In what SI unit is power of lenses rated?A convex lens has a focal length of 50cm.calculate its power.

find the position of an object when placed in front of a concave mirror of focal length 20 cm produces a virtual image,which is twice size of object.

The magnification produced by a mirror is 1/3 then the type of mirror is --------------. Explain why?

why danger signals are made of red colours

A STUDENT OBTAINS A BLURRED IMAGE OF AN OBJECT ON A SCREEN BY USING CONCAVE MIRROR. IN ORDER TO OBTAIN A SHARP IMAGE ON THE SCREEN, WHERE HE WILL HAVE TO SHIFT THE MIRROR?

An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.

A glass prism is able to produce a spectrum when white light passes through it but a glass slab does not produce any spectrum. Explain why is it so.

When an object is placed 20cm from a concave mirror , a real image magnified three times is formed. Find:

(a) focal length of the mirror.

(b) where must the object be placed to give a virtual image three times the height of the object?