Kindly check out the below video to learn about the concept of human eye and the colourful world. Watch the video till the end to complete the task.
The chapter on human eye and the colourful world is assigned a weightage of \(3\ or\ 4\) marks, highlighting its significance in the overall curriculum.
Also to prepare effectively for related exam questions. It is essential to grasp the concepts of parts and functions of the human eye, defects of vision and their correction, atmospheric refraction, dispersion, and scattering of light. Focusing on these concepts will greatly benefit both academic performance and practical application in physics.
In the below, we have provided the details of the question distribution among the different sections.
- Section A (\(1\) mark) - One question
- Section B or C (\(2\ or\ 3\) mark) - One question
Learning outcomes:
- Understanding eye structure: Describe the structure and function of the human eye, including its key parts like the cornea, lens, retina, and optic nerve.
- Identify the defects of vision: Detect the defects in the human eye (myopia, hypermetropia, presbyopia) and their causes in order to devise a correction method for them.
- Analyse the refraction of light through a prism: Examine the path of light rays through a prism in order to determine how the light gets deviates when traveling through a prism.
- Color perception: Understand how colors are perceived through the combination of different wavelengths of light.
- Visual phenomena: Explain various visual phenomena, such as the formation of rainbows and the appearance of colour of the sky
The eyeball has a diameter of about \(2.3 cm\) and is roughly spherical in shape.
Important parts of the human eye:
- Cornea - thin and transparent layer on the front surface of the eyeball
- Iris - coloured portion of the eye
- Pupil - centre of the Iris
- Retina - eye's back surface
- Eye Lens - convex in nature.
- Ciliary muscles - adjust the focal length of your eye lens
Working of Eye:
- Persistance of vision - If the time interval between two successive light pulses is less than \(\frac{1}{16}\ seconds\), the human eye cannot distinguish them separately.
- Power of accomodation - the capability of the eye lens to focus nearby and distant objects
Defects of eye:
- Myopia - shortsightedness - concave lens
- Hypermetropia - farsightedness - convex lens
- Presbyopia - old age hypermetropia - Bifocal lens
PYQ
Exam tips:
- Key words
- Understanding the question
- Diagram
- Arrow marks in diagram