Question

Why did they delete my previous question ??

Please answer these,its urgent!! See attachment​

Answer 1

$\huge\bf\red {\mid {\overline {\underline {Your\:Answers }}}\mid}$

$\underline {\Huge\text {Answer 11 (a)}}$

At the time of sunrise, the position of the sun is very far away from us. As a result, sunlight has to travel a large thickness of the atmosphere and a large proportion of the blue light and shorter wavelength gets scattered by the air particles. The red colour which has the longest wavelength is scattered the least and more red light reaches our eyes than any other colour. Hence, the sun appears red early in the morning .

$\underline{\Huge\text {Answer 11(b)}}$

A bifocal lens of suitable power is used to correct this defect.

$\underline {\Huge\text {Answer 12}}$

Size of object (h) = 4 cm

Magnification (m) = 0.16

Size of image (h') = ?

We knowthat, m = h'/h

=> 0.16 = h'/4

=> h' = 0.16 × 4 =

$\boxed{\Huge {0.64 cm}}$

$\underline{\Huge\text{Answer 13 (a)}}$

Soft iron is used as the core of electromagnet because it can be easily magnetized as well as demagnetized when the power is on or off in the solenoid .

$\underline {\Huge\text{Answer 14}}$

When the magnetic field lines and current carrying conductor is perpendicular to each other than the conductor carrying the current expense is maximum force.

An electric motor is based on the principle that a current carrying conductor placed in a magnetic field experiences a force and direction determined by Fleming's left hand rule. Whereas, in electric generator principle of electromagnetic induction is used.

$\underline {\Huge\text{Answer 17}}$

The person is suffering from $\bold{myopia}$.

In this case,

Object distance, u = -alpha

Image distance, v = -2 m

Since, 1/f = 1/v -1/u

=> 1/f = -1/2 -(-1/alpha)

=> 1/f = -1/2 + 0

=> 1/f = -1/2

=> f = -2 m

So, Power , P = 1/f = -1/2 D =

$\boxed {\Huge {-0.5 D}}$