Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

5 Questions

0 Views

Unveiling the Dangers

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main source of ultraviolet rays?

Sunlight

Name the three bands into which UV light has been divided and briefly explain their effects.

Ultraviolet A rays: absorbed by crystalline lens, protects retina, causes cataract formation. 2. Ultraviolet B rays: responsible for snow blindness and photo keratitis, can cause pingicula and pterigium formation. 3. Ultraviolet C rays: blocked by ozone layer.

How does ultraviolet A rays affect the eye?

They are absorbed by the crystalline lens and protect the retina, but prolonged exposure can cause cataract formation.

What are the effects of ultraviolet B rays?

<p>They are responsible for snow blindness and photo keratitis caused by welding arc, and can cause pingicula and pterigium formation with prolonged exposure.</p> Signup and view all the answers