LIGHT SHADOW AND REFLECTION

A _____________ surface reflects a parallel beam of light incident upon it in different direction. A___________ surface reflects a parallel beam of light incident upon in in one direction.

• rough and bumpy

• smooth and rough

• smooth and polished

• rough and smooth

Which letters of English alphabet will not show lateral inversion?

• A,E,I

• N,Z,X

• I,O,U

• I,X,E

Cloud is a ________________ object

• translucent

• transparent

• opaque

• none of the above

A and B are facing the mirror and standing in such a way that A can see B and B can see A . This means that...

• This is not possible.

• The light rays from B falls on the mirror and gets reflected and reaches B, the light from A falls on the mirror and reflects to reach A.

• The light is getting scattered to different directions

• The light rays from A falls on the mirror and gets reflected and reaches B, the light from B falls on the mirror and reflects to reach A.

Does polished surface cause glares in our eyes and why?

• Polished surface doesn't cause glares in our eyes because they do not reflect light.

• Polished surface cause glares in our eyes because they produce regular reflection of light.

• Yes, because we can see through them.

• None are correct

what do you mean by this? choose the most appropriate one.

• this means that when we hold a cylinder in both ways we get the same shadow

• this means that however the shape is held it has one type of shadow

• this means that when we hold a cylinder in one way we gets a circle shadow and when we hold it in other way we get rectangle shadow.

• both (a) and (c)

mohan set the experiment as shown below. The shadows mohan observed are shown below also. Which one of the following is correct about X and Y? pick the most appropriate option

• X and Y are opaque

• X and Y are transparent

• x was translucent and y was opaque

• x was transparent and y was opaque

HIMESH is cycling along a narrow path and ROHIT is walking along the same path as HIMESH. Two tall buildings are blocking their views of each other. Where should two mirrors be placed along the path such that HIMESH can see ROHIT from where both are now, in their positions as shown below. PICK THE MOST APPROPRIATE.

• R and T

• P and S

• P and T

• Q and T

What is the principle used in a pinhole camera?

• rectilinear propagation of light

• reflection of light

• lateral inversion

• none of the above

shadows are not trustable

• true

• false

• partially correct

• partially wrong