Question

Multiple-choice Questions
1. The radius of curvature of a flat surface is ........cm.
b) infinity
a) 0
c) 1
d) 100

If the number of divisions on the circular scale are 50 then the L. C. of the spherometer
whose pitch is 0.5cm, will be
a) 0.001
b) 0.01
c) 0.05 d).005​

Answer 1

Answer:

0,0.001cm

Explanation:

Flat surfaces does not have any radius of curvature .

Using the formula of LC

Answer 2

Given that,

Number of division = 50

Pitch = 0.5 cm

(1). The radius of curvature of a flat surface is ........cm.

We know that,

The focal length of the flat mirror is infinity.

$f=\infty$

The radius of curvature is equal to the double of focal length of the mirror.

$R=2F$

So, The radius of curvature of a flat surface is infinity.

(II). We need to calculate the least count of the spherometer

Using formula of least count

$L.C=\dfrac{pitch}{divisions\ of\ the\ circular}$

Put the value into the formula

$L.C=\dfrac{0.5}{50}$

$L.C = 0.01$

Hence, (I). The radius of curvature of a flat surface is infinity.

(b) is correct option

(II). The least count of the spherometer is 0.01.

(b) is correct option