What makes things visible - class-VI
Description: what makes things visible | |
Number of Questions: 47 | |
Created by: Shaka Gupte | |
Tags: light light and shadows wonders of visible light evs physics mirrors and reflections light and the formation of shadows reflection of light and shadow light, mirrors and lenses light, shadows and images our colourful world light and shadow celestial shadow sights magic with mirrors |
The reflection from a concrete sidewalk is a diffused reflection.
....... are drawn on light rays to show the direction in which light travels.
Luminous objects emit light on their own.
Which of the following is an example of a self-luminous body?
Which of the following is a natural source of light?
Light is _______________.
A source of light is :
Which of the following is a luminous body?
Which of the following is a non-luminous body?
The amount of light reflected depends upon
The ray of light which falls on a mirror is called-
Objects which emit light of their own are called -
Light is a form of energy that causes sensation of warmth or coldness
Reflection of the Sun's light from the upper layers of the Earth's atmosphere causes.
Select the odd one out (book, chair, table, burning candle)
A star is a/an _____ source of light
The silvering on the back surface of a mirror can be done by
Light is a form of energy.
We are able to see objects around us because ______________.
When a light ray is reflected repeatedly by a set of parallel plane mirrors, the intensity of light rays decreases after some reflections. This is because of
State whether true or false :
Choose the correct option
Choose the correct option regarding luminous objects
Which of the following is not a luminous object
Which of the following are not non-luminous objects ?
How are non luminous objects visible to eye ?
When Abhishek looked at a lighted torch through an object he could see a faint glow, but not the torch. The object is
Read the given statements and select the correct option.
Statement 1 : Rahul placed a coloured plastic bottle in front of the beam of a torch light. Then he placed a transparent sheet of same size on the other side of bottle. No shadow will form on the screen.
Statement 2 : Translucent objects allow light to pass through them partially.
Which of the following statements is true?
We cannot see things in the absence of
Ray optics is valid when characteristic dimension are
The difference in speeds of a ray of light in glass and water is $2.5 \times 10^7 \,m/s$. If the $R.I$ of glass and water are $\dfrac{3}{2}$ and $\dfrac{4}{3}$ respectively, then the velocity of light in air is
Light travels through a glass plate of thickness t and refractive index $\mu $ If c is the speed of light in vacuum, the time taken by light to travel this thicknes of glass is
It is necessary to illuminate the bottom of a well by reflected solar beam when the light is incident at an angle $40^o$ to the vertical. At what angle to the horizontal should a plane mirror be placed?
An invisible energy which causes in us the sensation vision, is
The illumination on the screen, in case of a movie hall if the distance between the projector and the screen is increased by $1\%$ will be:
Pick the only wrong statement in the following :
A broader bundle of light rays is called a -
What is the wavelength range of visible light?
In a YDSE with two identical slits, when the upper slit is covered with a thin, perfectly transparent sheet of mica, the intensity at the centre of screen reduces to $75\%$ of the initial value. Second minima is observed to be above this point and third maxima below it. Which of the following can be a possible value of phase difference caused by the mica sheet.