Question

Assertion (A) : The dark lines in solar spectrum are called Fraunhofer lines.
Reason (R): The elements in the chromosphere of the Sun absorb the light of their characteristic wavelengths coming from its photosphere.
A. Assertion (A) is correct Reason (R) is wrong
B. Assertion (A) is correct Reason (R) is right
C. Assertion (A) and Reason (R) both are correct but Reason (R) is not explaining Assertion (A)
D. Assertion (A) and Reason (R) both are correct and Reason (R) is explaining Assertion (A)

Answer 1

A sporadic layer over the photosphere where the temperature ascends from 6000 ° C to around 20,000 ° C is the chromosphere. Highlights of dull assimilation in the sun powered range. To pay tribute to J, they are named. Fraunhofer, who in 1814 first considered them (see outline). They are found at around 180 nanometers (nm) from the bright to 20 micrometers (μm) from the infrared.

Complete solution:
1.The elements in the outer atmosphere (chromosphere) of the Sun absorb the light of their characteristic wavelengths coming from the Sun's inner atmosphere (photosphere).
2.This is the cause of the existence of Fraunhofer lines. In the visible part of its spectrum, the reddish Colour of the chromosphere arises from one of the strongest emission lines, the bright red line caused by hydrogen, the element that dominates the Sun's composition, as we have already seen.
3.About 10,000 K is the temperature of the chromosphere. Fraunhofer lines The net absorption of light by a particular atom or molecule is represented by each line.
4.Although the Earth's telluric spectrum contributes lines of molecular oxygen (O2), carbon monoxide (CO), and other molecules, most form in the Sun's atmosphere.
The dark lines are called Fraunhofer lines in the solar spectrum.

Hence Assertion (A) and Reason (R) both are correct and Reason (R) is explaining Assertion (A)

Hence, the correct option is (D).

Note:
Some lines can be seen with a pocket spectroscope, such as Fraunhofer's C line in the red (hydrogen-alpha). Millions of lines are revealed by powerful research instruments, most of which are weak and blended together in an almost inextricable tangle.