THE HUMAN EYE class 10
Q-1) Draw a well labelled diagram of an human eye and Mark the following :a) cornea
b)iris
c)pupil
d)retina
e)ciliary muscles
f)optic nerve
Also give a function of each part of the human eye.
Q-2) What are Rods and Cones ?
Q-3) What is the range of vision of a normal human eye ?
Q-4) Define power of accommodation.
Q-5) Why does it take some time to see the objects in a dim room when we enter the room from bright
sunlight outside ?
Q-6) Define myopia.State two reasons due to which this eye defect may be caused.How it could be
rectified.Also draw the ray diagram for the correction of the above defect using appropriate lens.
Q-7) Define hypermetropic.State two reasons due to which this eye defect may be caused.How it could
be rectified.Also draw the ray diagram for the correction of the above defect using appropriate lens.
Q-8) Define presbyopia.How it is caused.How this eye defect can be corrected.
Q-9 ) Name the eye defect in which eye lens becomes cloudy or milky.Mention the method for its
correction.
Q-10) What is meant by dispersion of light? What is the cause of dispersion of light on passing through a
prism? List the colours into which it splits in the decreasing order of their bending on emergence from
prism. Which colour of white light suffers
a) least deviation.
b) maximum deviation when a beam of white light passes through a glass prism ?
Q-11) How can we recombine the components of white light after a prism has separated them.Also
draw the diagram to explain the process.
Q-12) Explain in brief the formation of rainbow with the help of figure.
Q-13) Why do stars appears to twinkle? Explain.
Q-14) Explain why the planet's do not twinkle.
Q-15) During sunrise and sunset sky appears red while during the day it appears blue.Explain these
natural phenomenon.
Q-16) What is meant by advance sunrise and delayed sunset? Draw a labelled diagram to explain these
phenomenon.
Q-17) Explaina)" Stars seem higher than they actually are".
b)"The sky appears dark to passengers flying at very high altitudes".
Justify these statements with reason.
Q-18) What is scattering of light ? Explain with the help of an example.
Q-19) What is Tyndall effect? What is it's caused? Name two phenomenon observed in daily life which
are based on Tyndall effect.
Q-20) Why danger signals are made of red colour?