45. Explain the three pathways of breakdown in living organisms.
46. If the distance between an object and its image in a plane mirror is 5.6 cm, how far is the object from
the mirror?
47. For what position of an object, a concave mirror forms a real image equal in size to the object?
48. For what position of an object, a concave mirror forms a virtual and magnified image?
49. If an object is placed at the focus of a concave mirror, where is the image formed?
50. A man standing in front of a spherical mirror finds his image having a very small head, a fat body and
legs of normal size. What types of mirrors are used in these three parts?
51. Why is light considered to be an electro-magnetic wave?
52. Differentiate between regular reflection and diffused reflection.
53. The letter E is placed in front of a plane mirror:
(a) How would its image look when seen in a mirror?
(b) What is the name of the phenomenon involved?
54. Explain lateral inversion
55. In what way is the word AMBULANCE printed in front of hospital vans? Why is it printed in this way?
Answers
45-The food that we consume is broken down into simpler products and then into energy which the body consumes to undertake various tasks.
The pathway chosen varies from organism to organism for breaking down glucose into energy and water.
The end product depends upon the presence of oxygen during the process of breakdown.
46-distance between the mirror and the object is the same
let the object distance be x
then the image distance is x
total,
x+x=5.6
2x=5.6
x=2.8
object distance=x=2.8
47-If we place the object at centre of curvature the image will form real and equal in size to the object .
48-The image in a plane mirror is not magnified (that is, the image is the same size as the object) and appears to be as far behind the mirror as the object is in front of the mirror. A diverging lens (one that is thicker at the edges than the middle) or a convex mirror forms a virtual image.
49-FORMATION OF DIFFERENT TYPES OF IMAGES BY A CONCAVE MIRROR. When the object is placed at infinity, the two rays AB and DE running parallel to the principal axis get reflected at point B and E respectively and intersect each other at the principal focus F on the principal axis.
50-The shapes of the three parts of the special mirror are:
#Convex mirror at the top as head size is diminished.
#Concave mirror in the middle as the body size is enlarged.
#Plane mirror at the bottom as the size of legs are same.
51-Scientists call them all electromagnetic radiation. The waves of energy are called electromagnetic (EM) because they have oscillating electric and magnetic fields. ... All EM energy waves travel at the speed of light. No matter what their frequency or wavelength, they always move at the same speed.
52-Regular reflection
1. In regular reflection the reflected light beams are always parallel to the incident light beam.
2. Regular reflection occurs from a nicely polished reflective surface.
Diffused reflection
1. In diffused reflection the reflected light beams are not parallel to the incident light bbeams.
2. It occurs from a diffused or irregular surface.
53-(a) The image of E in the mirror will be such that right end and left end is interchanged. (attachment)
(b) The phenomenon involved is known as lateral inversion. The image in the mirror is said to be laterally inverted.
54-The image is literally inverted. It means that in the image formed by a plane mirror the left and right sides are reversed.
This also can be explained as if you raise your right hand in front of a plane mirror then the appeared image will show that left had been raised.
55-The word AMBULANCE on the hospital vans is written in the form of its mirror image as image Ambulance because any vehicle which is ahead of ambulance van can see the laterally inverted alphabets correctly from his rear-view mirror and make way for it to pass through and enable it to reach the hospital quickly.