NECO ANSWER

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(2bi)
{TABULATE}
[UNDER REFLECTION OF LIGHT BY PLANE SURFACE]
(i) Forms an upright image always.
(ii) Image formed when light is reflected is always the same size as object.

[UNDER REFLECTION OF LIGHT BY CURVED SURFACE]
(i) Image formed by by curved mirror can be inverted or upright image formed.
(ii) Image formed depends on where the object is placed.

(2bii)
Angle about a point = 360°.
Angle between mirror = 360° – 320° = 40°.
No. of images formed by an inclined mirror = 360/∅ – 1,
Therefore, 360/40-1,
Therefore, 9 – 1 = 8.
Therefore, Number of images = 8 images.

( 1 bii )
Weight in Air = 2 . 9N
Weight in water = 1. 3N
Relative Density = ?
Relative Density = Weight in Air / Change in weight of
water
R . D = 2. 9 / (2 . 9 – 1 . 3 )
= 2 . 9/ 1. 6 = 1 . 8125
Relative Density = 1 . 813
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( 3 bi )
The positive terminal of the cells and the battery used
the circuit might not be connected potentiometer wire
Correction : In such case we will ensure if all
connections are tight and connecting wire are not
broken
( 3 bii )
Parallel – – – > Voltage remains the same
For series – – – > Connect remains the same
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