Fig. 5.24
32. State the conditions when only the penumbra of an
opaque object is obtained on the screen.
33. Why is it that the birds flying in the sky do not cast
their shadows on the earth?
34. Why are shadows at noon shorter than in the
morning or in the evening?
35. What is an eclipse? Name the two types of eclipses.
36. When does a lunar eclipse take place ? Does it
occur on every full moon's night?
37. Draw a diagram to show the formation of lunar
eclipse.
38. When does a solar eclipse take place ? Does it
occur on every new moon's day?
39. Draw a diagram to show the formation of solar
eclipse.
40. What is annular solar eclipse ? Draw a labelled
diagram to show its formation.
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