Light

Q- A swimmer sees only hazy contours of objects when he opens his eyes under water, while they are distinct when using a mask. Why?

Chapter: Light

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Q- The image of an object formed by a convex is obtained on a screen. Will the full size of image be obtained if the lower half of the is made completely opaque?

Chapter: Light

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Q- A concave lens is used in spectacles to correct myopia-Why?

Chapter: Light

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Q- If a piece of paper is held at the position of the virtual image of a strong light source, will the paper burn after sufficient time? What happens if the image is real? What happens if the image is real but the source is virtual?

Chapter: Light

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Q- Name four defects of human eye?

Chapter: Light

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Q- Do the focal lengths of lens and mirror depend on the colour of light ray?

Chapter: Light

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Q- Why does a convex lens of glass (µ=1.5)behave as a diverging lens when it is immersed in a liquid of R.l.= 1.8?

Chapter: Light

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Q- Name an instrument to produce pure spectrum?

Chapter: Light

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Q- White and black are not colours-explain.

Chapter: Light

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Q- . A poster coloured with green, yellow and red pigments is observed through a pure red glass. How do the following appear to the observer: (a) the green part (b) the yellow part and (c) the red part of the poster?

Chapter: Light

Light

Q- A swimmer sees only hazy contours of objects when he opens his eyes under water, while they are distinct when using a mask. Why?

View Answer

Q- The image of an object formed by a convex is obtained on a screen. Will the full size of image be obtained if the lower half of the is made completely opaque?

View Answer

Q- A concave lens is used in spectacles to correct myopia-Why?

View Answer

Q- If a piece of paper is held at the position of the virtual image of a strong light source, will the paper burn after sufficient time? What happens if the image is real? What happens if the image is real but the source is virtual?

View Answer

Q- Name four defects of human eye?

View Answer

Q- Do the focal lengths of lens and mirror depend on the colour of light ray?

View Answer

Q- Why does a convex lens of glass (µ=1.5)behave as a diverging lens when it is immersed in a liquid of R.l.= 1.8?

View Answer

Q- Name an instrument to produce pure spectrum?

View Answer

Q- White and black are not colours-explain.

View Answer

Q- . A poster coloured with green, yellow and red pigments is observed through a pure red glass. How do the following appear to the observer: (a) the green part (b) the yellow part and (c) the red part of the poster?

View Answer

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