Download App

The Human Eyes And The Colourful World — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceThe Human Eyes And The Colourful World2 Marks
Question
Why is a normal eye not able to see clearly the objects placed closer than 25cm?
✓

Answer

The normal eye is not able to see clearly the objects placed closer than 25cm because all the power of accomodation of the eye is exhausted at a distance of 25cm. The maximum accomodation of the eye is reached when the object is placed at 25cm fro the eye. After this the ciliary muscles cannot make the eye-lens more thick.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the questions.[Phy-2M]" from The Human Eyes And The Colourful World→The Human Eyes And The Colourful World — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Why can you not use a concave mirror as a rear-view mirror in vehicles?
→
State two advantages of producing hydroelectricity.
→
Why does a beam of light when it enters glass at an angle? Why does it not bend if it inters the glass at right angles?
→
Draw a circuit diagram to show how 3 bulbs can be lit from a battery so that 2 bulbs are controlled by the same switch while the third bulb has its own switch.
→
Draw a ray diagram to show the refraction of light through a glass prism. Mark on it,
  1. The incident ray,
  2. The emergent ray,
  3. The angle of deviation.
→
Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an observer on the moon? Justify your answer with a reason.

OR

Why does sun appear reddish at sunrise? Give reason.

→
An electric iron is rated at 230V, 750W. Calculate,
  1. The maximum current.
  2. The number of units of electricity it would use in 30 minutes.
→
Explain with the help of a diagram, why a pencil partly immersed in water appears to be bent at the water surface.
→
Complete the following statements:
When the sun is setting, the light from it has to travel a ____ thickness of the earth's atmosphere and only ____ wavelength _____ light is able to reach us. Sunset is therefore ___.
→
Why does the sun appear red at sunset?
→