Ray Optics and JEE Mains

Introduction

• Ray Optics: Expected 2 questions in JEE Mains.
• Focus: Reflected ray and refracted ray.

Laws of Reflection

• Applicable on any surface.
• Angle of Incidence = Angle of Reflection
• Coplanar: Incident ray, reflected ray, and normal.

Image Properties (Plane Mirror)

• Equidistant: Object and image at equal distance from the mirror.
• Size: The size of the image is equal to the size of the object.
• Erect Image: Same height, magnification 1.
• Virtual Image: Virtual image of a real object and real image of a virtual object.

Field of Vision and Velocity of Image

• Field of Vision: The area in which the image is visible.
• Velocity of Image: Image movement based on mirror movement.

Refraction Plane Surface

• Snell's Law: Specifically dependent on the speed and wavelength of light.

Rectangular Slab

• Deviation: Refracted path of light.
• Multiple Slabs: Apply Snell's Law directly.

Total Internal Reflection (TIR)

• Critical Angle: When light grazes emergence.
• TIR: Angle of incidence > critical angle.

Prism

• Angle of Deviation: Deviation angle of the light ray.
• Thin Prism: Dispersive power and angle of dispersion.

Refracted Curved Surface

• Formula: Image location and magnification.

Lens

• Lens Formula: Focal length, power of the lens.
• Breaking of Lens: Effect of breaking on the focal length.

Optical Instruments

• Simple Microscope: Formulas for magnification.
• Compound Microscope: Magnification, normal, and maximum adjustment.
• Telescope: Magnification, normal, and maximum adjustment.

Homework

• Practice all Previous Year Questions (PYQ).